2X-5Y=-21 4X+3Y=23 的二元一次方程组怎么解
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2X-5Y=-214X+3Y=23的二元一次方程组怎么解2X-5Y=-214X+3Y=23的二元一次方程组怎么解2X-5Y=-214X+3Y=23的二元一次方程组怎么解将2X-5Y=-21扩大两倍:4
2X-5Y=-21 4X+3Y=23 的二元一次方程组怎么解
2X-5Y=-21 4X+3Y=23 的二元一次方程组怎么解
2X-5Y=-21 4X+3Y=23 的二元一次方程组怎么解
将2X-5Y=-21扩大两倍:4X-10Y=-42
4X-10Y=-42①
4X+3Y=23②
②减①:13Y=65,Y=5
将Y=5带入②中,解得X=2
X=2
Y=5
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3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
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