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8 x 9 x 10 + 6 x 25 x 12 + 4 x 18 x 31 + 2 x 36 x 34
=72x10+72x25+72x31+72x34
=72x(10+25+31+34)
=72x100
=7200
8 x 9 x 10 + 6 x 25 x 12 + 4 x 18 x 31 + 2 x 36 x 34
=72 x 10 + 72 x 25 + 72 x 31 + 72 x 34
= 72 ( 10 + 25 + 31 + 34 )
= 72 x 100
= 7200
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42 x 2 = 84
34 x 2 = 68
12 x 3 = 36
21 x 3 = 63
k mk,mk k lại ^_-
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\(a,=\left(576-577\right)+\left(678-679\right)+\left(780-475\right)=-1-1+305=303\\ b,=158\times0=0\\ c,=12\left(36\times17\times34+15\right)=12\times20823=249876\)
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12 + 21 x 12 + 12 x 34
= 12 x ( 1 + 12 + 34 )
= 12 x 45
= 540
12 + 21 x 12 + 12 x 34
= 12 x 1 + 21 x 12 + 12 x 34
= 12 x (1+21+34)
= 12 x 56
= 672
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a) 576 + 678 + 780 - 475 - 577 - 679
= 780 - 475 + ( 576 - 577) - ( 678 - 679)
= 305 - 1 - 1
= 303
b) (126 + 32)\(\times\)(18 - 16 - 2)
= (126 + 32) \(\times\)0
= 0
c) 36 * 17 * 12 * 34 + 6 * 30
= 36 * 17 * 6 * 2 * 34 + 6 * 30
= 6 * (36 + 17 + 2 + 34 + 30)
= 6 * 119
= 714
12 x 2 = 24
34 : 2 = 17
ủng hộ nha
12x2=24
34:2= 17