1.求同时满足(5x-2)/4=>3(x+1)-7且(7x-2)/3>(3x+8)/5-4的正整数x.
1个回答
5x-2>=12(x+1)-28
5x-2>=12x-16
7x9x+24-60
26x>-46
x>-23/13
-23/13
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4(0.8+X)=7.2求X.5(X-6.5)=1.7求X.(X-1.8)/《除以》4=2.5求X.3(4+X)=12.
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用线性代数解x1+3x2+5x3+7x4 =12,3x1+5x2+7x3+x4=0,5x1+7x2+x3+3x4=1,7
1/4x-1/2=3/4;7x-5/4=3/8;2x-1/6=5x+1/8;1/2x-7=9x-2/6;1/5x-1/2