问题
解答题
计算: (1)(2a+3b+1)(1-2a-3b)+(2a-3b)2 (2)
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答案
(1)原式=1-(2a+3b)2+(2a+3b)2=1;
(2)原式=
•x x-1
+(x+1)(x-1) x(x-1)
=1 1-x
-x+1 x-1
=1 x-1
.x x-1
计算: (1)(2a+3b+1)(1-2a-3b)+(2a-3b)2 (2)
|
(1)原式=1-(2a+3b)2+(2a+3b)2=1;
(2)原式=
•x x-1
+(x+1)(x-1) x(x-1)
=1 1-x
-x+1 x-1
=1 x-1
.x x-1