计算:(1)2-2×(42×80)(2)(-m3)2•(-2m2)3÷(2m)2(3)(-3a2)•(2a-1)+a(1-3a)(4)(x-2y)(x2+2xy+4y2)
计算:
(1)2-2×(42×80)
(2)(-m3)2•(-2m2)3÷(2m)2
(3)(-3a2)•(2a-1)+a(1-3a)
(4)(x-2y)(x2+2xy+4y2)
数学人气:256 ℃时间:2020-03-24 12:09:11
优质解答
(1)2
-2×(4
2×8
0)=
×16×1=4;
(2)(-m
3)
2•(-2m
2)
3÷(2m)
2=m
6•(-8m
6)÷4m
2=-2m
10;
(3)(-3a
2)•(2a-1)+a(1-3a)=-6a
3+3a
2+a-3a
2=-6a
3+a;
(4)(x-2y)(x
2+2xy+4y
2)=x
3+2x
2y+4xy
2-2x
2y-4xy
2-8y
3=x
3-8y
3.
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