解方程组:3x+4y= -3.4,6x-4y=5.2 解方程组:(1)3x+4y= -3.4,6x-4y=5.2(2)7x-3y=5,-5x+6y=-6(3)x/4+y/3=7,x/3+y/2=8
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解方程组:3x+4y=-3.4,6x-4y=5.2解方程组:(1)3x+4y=-3.4,6x-4y=5.2(2)7x-3y=5,-5x+6y=-6(3)x/4+y/3=7,x/3+y/2=8解方程组:
解方程组:3x+4y= -3.4,6x-4y=5.2 解方程组:(1)3x+4y= -3.4,6x-4y=5.2(2)7x-3y=5,-5x+6y=-6(3)x/4+y/3=7,x/3+y/2=8
解方程组:3x+4y= -3.4,6x-4y=5.2
解方程组:(1)3x+4y= -3.4,6x-4y=5.2
(2)7x-3y=5,-5x+6y=-6
(3)x/4+y/3=7,x/3+y/2=8
解方程组:3x+4y= -3.4,6x-4y=5.2 解方程组:(1)3x+4y= -3.4,6x-4y=5.2(2)7x-3y=5,-5x+6y=-6(3)x/4+y/3=7,x/3+y/2=8
(1)3x+4y= -3.4,(1)
6x-4y=5.2 (2)
(1)+(2)得
9x=1.8
x=0.2
代入(1)得 y=-4
(2)7x-3y=5,(1)
-5x+6y=-6 (2)
(1)乘2+(2)得 9x=4 x=4/9
代入(1)得 y=-17/27
(3)x/4+y/3=7,(1)
x/3+y/2=8 (2)
(1)乘1/2-(2)乘1/3得,x=60
代入(1)得 y=-24
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