解方程组:4x+7y=-19 4x-5y=17
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解方程组 x+y/5+x-y/2=7 4(x+y)-5(x-y)=2
解方程组x+y/2+x-y/2=7,4(x+y)-5(x-y)=2...
解方程组:4x+7y=-19 4x-5y=17
解方程组8y+5x=84y-3x=7 方程组 因式分解 4x^3-4x^2y-(x-y)
解方程组 3x-5y=7 4x+2y=5解方程组3x-5y=74x+2y=5
解方程组:{4x+5(x-y)=30,4y-3(x-y)=6
解方程组3x+5(x+y)=2 3y-2(x+y)=4
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
3(x-y)+5(x-y)=19 4(x+y)-2(x-y)=-1解方程组是3(x+y)
用代入法解此方程组:(x+y)/2+(x-y)/3=6 4(x+y)-5(x-y)=2求方程组的正整数解:x+y+z=7 2x+3y+4z=20
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3
解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27
解二元一次方程组{x+y/2+x-y/3=6,4(x+y)-2=5(x-y)
解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2()
解方程组2分之x+y+3分之x-y=6 4(x+y)-5(x-y)=2
解方程组 {3(x+y)-4(x-y)=11 {2(x-y)+5(x+y)=27全过程、快
解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4