计算:
(1)=______;
(2)=______;
(3)=______;
(4)(2b)3=______;
(5)4y?(-2xy2)=______;
(6)28x4y2÷7x3y=______;
(7)(a+b)(a-b)=______.
网友回答
解:(1)==2;
(2)==3;
(3)==0.1;
(4)(2b)3=23?b3=8b3;
(5)4y?(-2xy2)=4×(-2)?x?(y?y2)=-8xy3;
(6)28x4y2÷7x3y=(28÷7)?(x4÷x3)?(y2÷y)=4xy;
(7)(a+b)(a-b)=a2-b2.
故