解方程组:(1)3x+y/2=x+2y/3=1 (2){6(x-y)-7(x+y)=21①{2(x-y)-5(x+y)=-1②(3){x+y+z=6 x+2y-3z=4 2x-y+z=5(4){x/3+y/4=2 3x-4y=-7
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解方程组:(1)3x+y/2=x+2y/3=1 (2){6(x-y)-7(x+y)=21①{2(x-y)-5(x+y)=-1②(3){x+y+z=6 x+2y-3z=4 2x-y+z=5(4){x/3+y/4=2 3x-4y=-7
解方程组:(1)3x+y/2=x+2y/3=1 (2){6(x-y)-7(x+y)=21①{2(x-y)-5(x+y)=-1②
(3){x+y+z=6 x+2y-3z=4 2x-y+z=5
(4){x/3+y/4=2 3x-4y=-7
解方程组:(1)3x+y/2=x+2y/3=1 (2){6(x-y)-7(x+y)=21①{2(x-y)-5(x+y)=-1②(3){x+y+z=6 x+2y-3z=4 2x-y+z=5(4){x/3+y/4=2 3x-4y=-7
y/3-x 1/6 = 3 ------(1)
2(XY / 2)= 3(X + y/18)------(2)(1)上的相同的两侧乘以6 2Y-6×1 = 18 2Y-6X = 17 ---(3)
(2)2X-Y = 3X + Y /两侧6同乘6 12X-2017 = 18X + Y
6X +7 Y = 0 ---(4)
(3)+(4)为1416米= 17 Y =九分之一十七入(4)
X = - 五十四分之一百十九
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解方程组:x+y/2+x-y/3=6,(x+y)+5(x-y)=38 谢.