8/2/2019 Tiet 51Luyen Tap

1/19

Phng gio dc - o to qun hi an___________________________________________________________

Nhit lit cho mng cc thy c gio

V d gi lp 7C1

Nhit lit cho mng cc thy c gio

V d Gi lp 6D1

Gio vin: PHAN TH LNHTr- ng thcs trng ct

Nm hc 2009 - 2010Nm hc 2011 - 2012

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8/2/2019 Tiet 51Luyen Tap

2/19

Kim tra bi c

Hs1: Pht biu quy tc tm hiu hai s nguyn? Vitcng thc tng qut. p dng tnh:

a) 3 9 b) 1- ( -3)

s : n o a s n au na) ( - 5 ) 7 b) 7 ( - 5 )

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8/2/2019 Tiet 51Luyen Tap

3/19

Bi 53 (Sgk/82). in s thch hp vo trng

xx --22 --99 33 00

yy 77 --11 88 1515

xx -- yy - -

Cha bi v nh

- -

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8/2/2019 Tiet 51Luyen Tap

4/19

Bi 52SGK/ 82.

Tnh tu

i th

c

a nh bc h

c c- si- mt, bi

t r

ngng sinh nm 287 v mt nm -212

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8/2/2019 Tiet 51Luyen Tap

5/19

Dng 2: Thc hin dy cc php tnh cng tr cc snguyn.

Bi 81 (SBT - 64)Tnh:

a) 8 ( 3 7 ) b) ( - 5 ) ( 9 12 )

c) ( - 4 ) + 5 - 7

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8/2/2019 Tiet 51Luyen Tap

6/19

Dng 3: Tm mt s trong hai s hng khi bit tnghoc hiu v s hng kia.

Bi 54(SGK - 82)Tm s nguyn x bit:a) 2 + x = 3 b) x + 6 = 0

Bi tp:Tm x, bit:a) x 5 = - 2 b) 10 x = - 3

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8/2/2019 Tiet 51Luyen Tap

7/19

Dng 4: Tm s i ca mt s cho trcBi 49 SGK/82(BVN). in s thch hp vo trng

aa --1515 00-- aa -- 22 --(( -- 3 )3 )15

20

-3

Bi tp:

Ba bn An, Bnh , Cam tranh lun v k hiu a nh sau:

An ni: a lun l s nguyn m, v n c du ng trc.

Bnh ni khc: a l s i ca a, nn l s nguyn dng.

Cam tranh lun li: a c th l bt k s no, v a l s i caa, nn nu a l s nguyn dng th a l s nguyn m,

nu a = 0 th a = 0

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8/2/2019 Tiet 51Luyen Tap

8/19

a) ( - 5 ) 7 b) 7 ( - 5 )

= ( - 5 ) + ( - 7 ) = 7 + 5

= - 12 = 12

KTBC: Hs2

Do a-b v b-a l hai si nhau nn nu bit hiu a-b khng

Bi 87SBT/63: C th

k

t lu

n g v

d

u c

a s

nguynx khc 0 nu bit:a) x + | x| = 0 b) x - | x | = 0

- .V d: 10-1=9 th th 1- 10 = - 9

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8/2/2019 Tiet 51Luyen Tap

9/19

Dng 5: vui lin quan n php tr

Bi 55SGK/82. Ba bn Hng Hoa, Lan tranh lun vi nhau:

Hng ni rng c th tm c hai s nguyn m hiu ca chng lnhn s b tr, Hoa khngnh rng khng th tm c hai s nguynm hiu ca chng ln hn c s b trv s tr.

Bn ng vi kin ca ai ? V sao ? Cho v d.

V d: a) ( -2) ( - 1) = -1,hiu( -1) ln hn s b tr ( -2)

( kin ca Hng)

b) ( - 2) ( -3) = 1, hiu ( 1) ln hn s b tr ( -2) v lnhn s tr ( -3) ( kin ca Lan)

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8/2/2019 Tiet 51Luyen Tap

10/19

Dng 6: S dng my tnh b ti.

Bi 56SGK/82.Dng my tnh b ti tnh:a) 169 733

b) 53 ( - 478)

= - 564

= 531

c) 135 ( - 1936) = 1081

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8/2/2019 Tiet 51Luyen Tap

11/19

Tr chi Tr chi Tr chi

1

25

4

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8/2/2019 Tiet 51Luyen Tap

12/19

2

p n: 149 - 633

Cu 2: Thc hin php tnh:Cu 2: Thc hin php tnh:

149149 -- 633633

Nhanh ln cc bni !

C lnc ln..... n!

Thi gian: 10987654321Htgi1315141211

= 149 + ( - 633)= - 484

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8/2/2019 Tiet 51Luyen Tap

13/19

1

Cu 1: S i ca 3 - 20

Thi gian: 10987654321Htgi1514131211

p n: 17

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8/2/2019 Tiet 51Luyen Tap

14/19

4Cu 4: Chic diu ca bn Sn bay

cao 12m (so vi mt t). Sau mt lc cao ca chic diu tng thm 3m risau gim i 4m. Hi chic diu cao bao nhiu mt (so vi mt t) sauhai ln tha i?

Thi gian: 10987654321Htgi1112131415

p n:12+ 3+(-4) = 11 (m)

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8/2/2019 Tiet 51Luyen Tap

15/19

3

Cu 3: Tm khong cch giahai im 3 v 6 trn trc s

Thi gian: 10987654321Htgi1112131415

6 ( -3 )= 6 + 3= 9

Nhanh ln

cc bn i !C lnc

ln.... n!

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8/2/2019 Tiet 51Luyen Tap

16/19

5

Trong Z khi no php tr

khng thc hin c?

Thi gian: 10987654321Htgi1112131415

p n: Trong Zphp tr

bao gicng thc hin c.

Nhanh ln

cc bn i !C lnc

ln.... n!

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8/2/2019 Tiet 51Luyen Tap

17/19

BBn n tt duyduy

Luyn tp php tr2 s nguyn

S dng my tnhb ti Quy tc php tr

Cng 2 s nguyn cng du

Cng 2 s nguyn khc du

Tm s hng khi bit tng hochiu

s i

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8/2/2019 Tiet 51Luyen Tap

18/19

- n tp cc quy tc cng, tr s nguyn.-V hcbi,lmbi 51 SGK/82,

SBT t bi75 - 78 (63)- c trc bi quy tc du ngoc.

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8/2/2019 Tiet 51Luyen Tap

19/19

Xin chan thanh cam nqu thay co en tham d.

uc qu ay co n eu s c oe vahanh phuc.

Chuc cac em hoc sinh luon vui ti vahoc gioi.

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