是135道计算题-查字典问答网
贺鑫元
不等式:
1.已知不等式x+y0,则a__b.
(2)如果a-b=0,则a__b.
(3)如果a-b4;(2)2x0
答案:
1.x2(4x+3)
10_4(x-4)x-5/4
2x+5
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