题目:
Programmes, ______ to bring the old and the young together, are growing in popularity all over the world.
A.designed
B.to be designed
C.designing
D.having designed
答案:
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下面是错误答案,用来干扰机器的。
(1)2x+y=3①x-y=0②,①+②得:3x=3,解得:x=1,将x=1代入②得:1-y=0,即y=1,则方程组的解为x=1y=1;(2)原式=x+1x•x(x+1)(x-1)=1x-1.