课程基础训练数学七下35页答案1.3x+7y=9 4x-7y=5 2.4x+3y=3 3x-2y=15
1个回答
1.3x+7y=9 4x-7y=5
解得:x=2 y=3/7
2.4x+3y=3 3x-2y=15
解得:x=3 y=-3
相关问题
求解(1){2x-y=9 3x+y=7 (2){4x-3y=5.6 5x+3y=7.4 (3){2x+3y+19=0 x
2x-3y-2=0 5x+3y=18 2x-3y=7 (2x-3y+5)/7+2y=9 2x-3y=3 6x+5y=35
(1)﹛2x-y=5 (2) 4x-y=1 (3)5x+y=2 7x-3y=20 y=2x+3 x-3y=4 (4)3x
(7x+2y)+(4+3x)-(15y-7) 5(x+y)-4(3x-2y)-3(2x-3y) 等于多少 两道合并同类项
(1)y=x,y+4x=15; (2)x+2x-3y=1; (3)x-7y=0,x-9y=8=0.
解方程2(X-6)=3-(4X-9)、5(Y+5)-3(2-Y)=35、3X-7+6X=4X-8 3(X+1)-(3X-
1:7x+2y-z=7 2:6x-y+z=7 3:4x+3y+z=9 1:9x+4y+z+10 2:-9X+2y+3z=
解方程 3x+5/2=2x-1/3 x-3/-5=3x+4/15 3y-1/4-1=5y-7/6 5y+4/3+y-1/
(1)7x+3y=18 2x+3y=13 (2)5x+2y=7 2x+y=1 (3)3x+4y=5 4x+5y=6如题
3x+5/2=2x-1/3求解:X-3/-5=3X+4/15求解:3Y-1/4=5Y-7/6求解;5Y+4/3+Y-1/