解方程组:{5x-4y=12① {3x-y=7②
解方程组(x/2-y/5=4①,x/7-y/15=3②)
解方程组:①3x-7y=1,5x-4y=17②23x+17y=63,17x+23y=57
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
解方程组4x+7y=37①6x+3y②
1.解方程组 2x+6y=3① 3x+15y+2z=5② 4x-9y+4z=7③ 2.求方程组5x+3y=-16①6x-
解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7
1/2x-2y=-74,x-6y=-12解方程组,x/5-y/2=2,2x+3y=4解方程组
方程组5x+2y=7① 3x+4y=7②怎么解,
用加减法解方程组①2x-5y=(-26) ②3x+4y=7
方程组3x-y=5① 4x-7y=1②怎么解求过程
解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6
解方程组24/(x+y) +24/(x-y) = 7/3 ,8/(x+y) +18/(x-y) = 4/3