问题
填空题
计算: (1)2x2•(-4xy)2=______; (2)(a-3b)•______=a3-27b3; (3)(12a3b2c-8a4b2c2-10abc)÷
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答案
(1)2x2•(-4xy)2,
=2x2•16x2y2,
32x4y2;
(2)原式=(a3-27b3)÷(a-3b)=(a2+3ab+9b2);
(3)(12a3b2c-8a4b2c2-10abc)÷
abc,2 3
=12a3b2c÷
abc-8a4b2c2÷2 3
abc-10abc÷2 3
abc,2 3
=18a2b-12a3bc-15.