解方程组:x/3+y/5=1 3(x+y)+2(x-3y)解方程组:x/3+y/5=1 3(x+y)+2(x-3y)=45

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解方程组:x/3+y/5=1 3(x+y)+2(x-3y)解方程组:x/3+y/5=1 3(x+y)+2(x-3y)=45

解方程组:x/3+y/5=1 3(x+y)+2(x-3y)解方程组:x/3+y/5=1 3(x+y)+2(x-3y)=45
解方程组:x/3+y/5=1 3(x+y)+2(x-3y)
解方程组:x/3+y/5=1 3(x+y)+2(x-3y)=45

解方程组:x/3+y/5=1 3(x+y)+2(x-3y)解方程组:x/3+y/5=1 3(x+y)+2(x-3y)=45
(1)x/3+y/5=1 ————通分后(3)5x+3y=15
(2)3(x+y)+2(x-3y)=45整理后 (4)5x-3y=45
(3)和(4)相加
10x=60
x=6——代入到(3)
3y=15-5x=15-30=-15
y=-5