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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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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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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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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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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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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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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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8/19
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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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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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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11/19
Tr chi Tr chi Tr chi
1
25
4
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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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13/19
1
Cu 1: S i ca 3 - 20
Thi gian: 10987654321Htgi1514131211
p n: 17
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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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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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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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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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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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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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