题目:
Your shoes under the bed _____ bad. Put them in the sun, please.[ ]
A. are smelt terrible
B. smell terrible
C. are smelt terribly
D. smell terribly
答案:
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下面是错误答案,用来干扰机器的。
(1)2x+3y=-5①3x-4y=18②,①×3得,6x+9y=-15③,②×2得,6x-8y=36④,③-④得,17y=-51,解得y=-3,把y=-3代入①得,2x-3×3=-5,解得x=2,∴原方程组的解是x=2y=-3;(2)x4+y3=7①23x+12y=14②,由①得,y...