解方程组2x+3y-2=0,4x+1=9y还有2分之m-2分之n=13,3分之m-4分之n=3要对
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解方程组2x+3y-2=0,4x+1=9y还有2分之m-2分之n=13,3分之m-4分之n=3要对
解方程组2x+3y-2=0,4x+1=9y
还有2分之m-2分之n=13,3分之m-4分之n=3
要对
解方程组2x+3y-2=0,4x+1=9y还有2分之m-2分之n=13,3分之m-4分之n=3要对
2x+3y-2=0,4x+1-9y=0
4x+6y-4=0,4x+1-9y=0
两式相减得:15y=5 ,y = 1/3
x=(9y-1)/4=1/2
m/2 - n/2=13 ,m/3-n/4=3
m-n=26,m-3n/4=9
两式相减得:
-n/4 = 17
n = -68
m= 26 +n = 26-68= -42
1.x=1/2,y=1/3
2.m=-42,n=-68
x=1/2
y=1/3
m=-42
n=-68
x等于2分之1.y等于3分之1
m=-42,n=-68
2x+3y=2
4x-9y=-1
4x+6y=4
15y=5
y=1/3
x=1/2
2x+3y-2=0①
4x+1=9y②
①*2
4x+6y-4=0③
③-②
15y=5
y=1/3
x=1/2