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沪科版数学书七年级下册习题9.2答案

时间:2016-09-22 来源:书通网

习题9.2第1题答案

(1)2/3a;

(2)y2d/4c;

(3)a/2;

(4)3/2xy

习题9.2第2题答案

解:(1)原式=(x-1)(x-1)/x(x-1)·x(y-1)/y-1

=x+1;

(2)原式=1/(x-y)2·x-y/x+y

=1/x2-y2

(3)原式=x(y-x)·xy/x-y

=-x2y;

(4)原式=x-3/x(x+1)·1/(x-3)2

=1/x(x+1)(x-3)

=1/x3-2x2-3x

习题9.2第3题答案

解:(1)原式=(-xy/a)·a2/x2=-ay/x

习题9.2第4题答案

习题9.2第5题答案

解:(1)原式=2x+7- (x+3)/3x+1

=2x+7-x-3/3x+1=x+4/3x+1

(2)原式=3c/c-d+3d+c/c-d

=3c+3d+c/c-d

=4c+3d/c-d

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