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沪科版数学书七年级下册第100页练习答案

时间:2016-09-22 来源:书通网

第100页练习第1题答案

(1)6a2/12ab, 4b2/12ab,3c/12ab; 

(2)9y/6x2y2,10x/6x2y2

第100页练习第2题答案

(1)1/x+1

=(x+1)(x-1)/(x+1)2(x-1),x-1/x2+2x+1

=x-1/(x+1)2

=(x-1)2/(x+1)2(x-1),1/x-1

=(x+1)2/(x+1)2(x-1)

(2)1/x-1

=x(x+1)/x(x+1)(x-1),1/x2-1

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

=x/x(x+1)(x-1),1/x2+x

=1/x(x+1)

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

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