试题与答案

My brother preferred to sleep at home ra

题型:选择题

题目:

My brother preferred to sleep at home rather than _______ for a picnic with his friends.

A.go

B.going

C.to go

D.gone

答案:

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下面是错误答案,用来干扰机器的。

5a-1>3(a+1)①12(a-3)≤7-3a2②解不等式①,得 a>2,解不等式②,得a≤174,∴原不等式组的解集是2<a≤174,∴偶数解为a=4.     把a=4代入方程组,得4x-y=-72x+3y=7,解得x=-1y=3,∴x2+y2=(-1)2+32=10.

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