题目:
This is the only way that I can think of _______ the problem of water waste in urban areas.
A.settling
B.to settle
C.settle
D.settled
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=3+1+33-1+14-3=33+14;(2)原式=13×(-4)×6×-x2y•(-y2x)•x3y=-8x4y2=-8x2y;(3)∵x=23-1,∴x=3+1,∴原式=(3+1)2-(3+1)+1=3+23+1-3-1+1=4+3.