5x+7y=231,7x+5y+18=231求解过程
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5x+7y=231,7x+5y+18=231求解过程5x+7y=231,7x+5y+18=231求解过程5x+7y=231,7x+5y+18=231求解过程5x+7y=231,7x+5y+18=231
5x+7y=231,7x+5y+18=231求解过程
5x+7y=231,7x+5y+18=231求解过程
5x+7y=231,7x+5y+18=231求解过程
5x+7y=231,7x+5y+18=231
两式相加
12x+12y+18=462
12x+12y=444
x+y=37
y=37-x
7x+5(37-x)+18=231
7x-5x+185+18=231
2x=231-203
x=28
x=14
y=37-14=23
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
3x+5y-(x+y)=6 2(x+y)-3x=-7
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
3x-y+x=3 4【X-y-1】=3【1-y】-1 5x-4y+4x=3 2x+y-3x=11 【 x除以2 】-【y 除以3】 =2 2x+7y-3x=19 x+y+x=12 3x+2y-x=18
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
5x+7y=7x+5y+18
{x+y=7 {2x-5y=-21
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
{2x+y/3-2y=0 2(2x+y)-5=7y
把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方=
5(x+y-2)=3-y x+7分之18y=-七分之一
7x-3y/5=5x-y/3-x+y/2 x-1/5=y+1/3
解方程组x+y/5+x-y/7=2 3(x+y)+x-y/7=16
解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2
方程2分之x+y+2分之x-y=7,4(x+y)-5(x-y)=2
二元二次方程(x+y)(x-2y)=-5,(x-y)(x+2y)=7 怎么解
解方程组x+y/2+x-y/2=7,4(x+y)-5(x-y)=2...