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12 + 7 x 8 = 12 + x
12 + 56 = 12 + x
12 + 56 = 12 + 56
Vậy suy ra x = 56
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a) (12 + 8) x 4 = 20 x 4
= 80
12 + 8 x 4 = 12 + 32
= 44
b) 25 + 75 : 5 = 25 + 15
= 40
(25 + 75) : 5 = 100 : 5
= 20
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( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5 )
= 0
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Đáp án:
( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )
= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5 )
= 0
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12 x 3 + 12 x 8 - 12
=12 x 3 + 12 x 8 - 12x1
=12x(3+8-1)
= 12 x 10
= 120
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a. 4 x 126 x 25
= (4 x 25) x 126
= 100 x 126
= 12600
b. (9 x 8 – 12 – 5 x 12) x ( 1 + 2 + 3 + 4 + 5)
= (72 – 12 – 60) x ( 1 + 2 + 3 + 4 + 5)
= 0 x ( 1 + 2 + 3 + 4 + 5)
= 0
x + 12 = 96
x = 96 - 12
x = 84
x + 12 = 12 x 8
x + 12 = 96
x = 96 - 12
x = 84