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a ) 32.( - 64 ) - 64.68
= - 64 x ( 32 + 68 )
= -64 x 100
= -6400
b ) - 54.76 + 12 (.-76) - 76.(-34)
= 76 x ( - 54 + -34 + 12 )
= 76 x (-76 )
= (-5776)
c ) 19 - 42.(-19) + 38 x 5
= 42 x ( 19 + - 19 ) + 38 x 5
= 42 x 0 + 38 x 5
= 0 + 38 x 5
= 38 x 5
= 190
=)
a) 32 . ( -64 ) - 64 . 68
= ( 32 + 68 ) . ( - 64 )
= 100 . ( - 64 )
= ( - 6400 )
b) ( - 54 ) . 76 + 12 . ( - 76 ) - 76 . ( - 34 )
= 76 x ( -54 + -34 + 12 )
= 76 x ( - 76 )
= ( - 5776 )
c) 19 - 42 . ( -19 ) + 38 . 5
= 42 . ( 19 + -19 ) + 190
= 42 . 0 + 190
= 0 + 190
= 190
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a: =-64(32+68)=64x100=-6400
b: =76(-54-12+36)=76x(-30)=-2380
c: =19x50+38x5=950+190=1140
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Bài 1
a, 32.(-64) - 64. 68
= -64.(32 + 68)
= -64 .100
= - 6400
b, -54.76 + 12.(-76) - 76.34
= -76.(54 + 12 + 34)
= -76.100
= -7600
19- 42.(-19) + 38.5
= 19 + 42.19 + 19.2.5
= 19.(1 + 42 + 10)
= 19.53
= 1007
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![](https://rs.olm.vn/images/avt/0.png?1311)
-54.76+12.(-76)-76.(-34)
=(-54).76+(-12).76-76.(-34)
=76 [(-54)+(-12)-(-34)]
=76 (-32)
= -2432
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1a) -54 . 76 + 12 .(-76) + 76.(-34)
= (-54 - 12 - 34).76
= -100 . 76
= -176
b) 37.(63 - 24) - 63.(24 + 37)
= 37 . 63 - 37 . 24 - 63.24 - 63 . 37
= (37.63 - 63.37) - (37 + 63) . 24
= 0 - 100 . 24
= - 2400
2a) x + (-27) = -23 - x
=> x + x = -23 + 27
=> 2x = 4
=> x = 4 : 2
=> x = 2
b) xy + 2x - y = 15
=> x(y + 2) - y = 15
=> x(y + 2) - (y + 2) = 13
=> (x - 1)(y + 2) = 13 = 1 . 13 = 13 . 1
Lập bảng :
x - 1 | 1 | -1 | 13 | -13 |
y + 2 | 13 | -13 | 1 | -1 |
x | 2 | 0 | 14 | -12 |
y | 11 | -15 | -1 | -3 |
Vậy ...
a) (-54).76 + 12.(-76) - 76.(-34)
= (-54).76 + (-12).76 - 76.(-34)
= 76. [(-54) + (-12) - (-34)]
= 76. (-32)
= -2432