问题
解答题
计算.
(1)(-6a2b5c)÷(-2ab2)2
(2)(2x+y)2-(2x+3y)(2x-3y)
答案
(1)原式=(-6a2b5c)÷4a2b4=-
bc.3 2
(2)原式=4x2+4xy+y2-4x2+6xy-6xy+9y2
=4xy+10y2.
计算.
(1)(-6a2b5c)÷(-2ab2)2
(2)(2x+y)2-(2x+3y)(2x-3y)
(1)原式=(-6a2b5c)÷4a2b4=-
bc.3 2
(2)原式=4x2+4xy+y2-4x2+6xy-6xy+9y2
=4xy+10y2.