2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
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2(x+y)-3(x-y)=16(x+y)+(x-y)=512(x+y)-3(x-y)=16(x+y)+(x-y)=512(x+y)-3(x-y)=16(x+y)+(x-y)=512(x+y)-3(x
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
2(x+y)-3(x-y)=1
2x+2y-3x+3y=1
-x+5y=1
6(x+y)+(x-y)=51
7x+5y=61
8x=60
x=15/2
y=17/10
第一个式子可化为:5y-x=1;第二个可化为:7x+5y=51
联立方程组,因为第一个式子中,x=5y-1,带入第二个式子中,40y-7=51,所以可得:y=58/40
可算出x=58/8-1=50/8你确定是对的吗只要你给的式子没错,那就没错。 补充:y=58/40=29/20,这是约分后的结果;x=50/8=25/4,也是约分后的最简结果...
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第一个式子可化为:5y-x=1;第二个可化为:7x+5y=51
联立方程组,因为第一个式子中,x=5y-1,带入第二个式子中,40y-7=51,所以可得:y=58/40
可算出x=58/8-1=50/8
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2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
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【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
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(x-2y)(x+y)-2x(-2x-3y)+6x(-x-y),其中x=-1,y=2
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{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
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(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
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(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5