3(X-1)=Y+5 5(Y-1)=3(x+5) 解下列方程组
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3(X-1)=Y+5 5(Y-1)=3(x+5) 解下列方程组
3(X-1)=Y+5 5(Y-1)=3(x+5) 解下列方程组
3(X-1)=Y+5 5(Y-1)=3(x+5) 解下列方程组
3(X-1)=Y+5(1)
5(Y-1)=3(x+5)(2)
由(1)得:3x-y=8(3)
由(2)得到:3x-5y=-20(4)
(3)-(4)得:4y=28
y=7
把y=7代入(3)得到:3x-7=8
3x=15
x=5
所以:此方程组的解是
x=5
y=7
x=5
y=7
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值;
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1.5(x+y)+3(x-y)=27(x+y)-3(x-y)=-62.x-y/7 - x+y/10 =1/22(x-y)-5(x+y)=3所谓细节决定成败,
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