{二分之一x-三分之一y=1 -五分之一x-y=三分之二 {0.4x+0.3y=0.7 11x-10y=1还有.{五分之二x-三分之一y+1=0 2x+2y=7 {-2x-11y=3m bx+29y=-7m(m为常数) {2x-3y=2 7分之 2x-3y+5 +2y=9 谁帮帮我啊,谢
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![{二分之一x-三分之一y=1 -五分之一x-y=三分之二 {0.4x+0.3y=0.7 11x-10y=1还有.{五分之二x-三分之一y+1=0 2x+2y=7 {-2x-11y=3m bx+29y=-7m(m为常数) {2x-3y=2 7分之 2x-3y+5 +2y=9 谁帮帮我啊,谢](/uploads/image/z/325825-25-5.jpg?t=%7B%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80x-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80y%3D1+-%E4%BA%94%E5%88%86%E4%B9%8B%E4%B8%80x-y%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C+%EF%BD%9B0.4x%2B0.3y%3D0.7+11x-10y%3D1%E8%BF%98%E6%9C%89.%EF%BD%9B%E4%BA%94%E5%88%86%E4%B9%8B%E4%BA%8Cx-%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80y%2B1%3D0++++++++2x%2B2y%3D7+%7B-2x-11y%3D3m+++++++++bx%2B29y%3D-7m%28m%E4%B8%BA%E5%B8%B8%E6%95%B0%29+%7B2x-3y%3D2++++++++7%E5%88%86%E4%B9%8B+2x-3y%2B5+++++%2B2y%3D9+%E8%B0%81%E5%B8%AE%E5%B8%AE%E6%88%91%E5%95%8A%2C%E8%B0%A2)
{二分之一x-三分之一y=1 -五分之一x-y=三分之二 {0.4x+0.3y=0.7 11x-10y=1还有.{五分之二x-三分之一y+1=0 2x+2y=7 {-2x-11y=3m bx+29y=-7m(m为常数) {2x-3y=2 7分之 2x-3y+5 +2y=9 谁帮帮我啊,谢
{二分之一x-三分之一y=1 -五分之一x-y=三分之二 {0.4x+0.3y=0.7 11x-10y=1
还有.
{五分之二x-三分之一y+1=0 2x+2y=7
{-2x-11y=3m bx+29y=-7m(m为常数)
{2x-3y=2 7分之 2x-3y+5 +2y=9
谁帮帮我啊,谢谢了!
{二分之一x-三分之一y=1 -五分之一x-y=三分之二 {0.4x+0.3y=0.7 11x-10y=1还有.{五分之二x-三分之一y+1=0 2x+2y=7 {-2x-11y=3m bx+29y=-7m(m为常数) {2x-3y=2 7分之 2x-3y+5 +2y=9 谁帮帮我啊,谢
1.解方程组1/2x-1/3y=1 -1/5x-y=2/3得x=46/39 y=-16/13
2.解方程组0.4x+0.3y=0.7 11x-10y=1得x=1 y=1
3.解方程组得y=6 代入2x=2y=7得x=-5/2把x=-5/2代入2/5x-1/3y+1不等于0,因此本方程组无解.
4.解方程组得y=-8m/(58-11b) x=-164m+77b/b(58-11b)
5.解方程组得x=7 y=4