过来解决下数学踢{5x-3y=4m-24y-4x=3

问题描述:

过来解决下数学踢
{5x-3y=4m-2
4y-4x=3

5x-3y=4m-2 (1)
4y-4x=3 (2)
(1)+(2)可得:x+y=4m+1 (3)
(2)式两边同时除以4则得:x-y=-3/4 (4)
(3)+(4)得:2x=4m+1/4,则x=2m+1/8
(3)-(4)得:2y=4m+7/4, 则y=y=2m+7/8

两式相加得:x+y=4m+1
x-y=-3/4
易得:x=2m+1/8; y=2m+7/8

5x-3y=4m-2 (1)
4y-4x=3 (2)
(1)×4+(2)×3 得到新的式子:
20x-12y+12y-12x=16m-8+9
8x=16m+1
x=2m + 1/8 (3)
(2)式提取公因数,移项后得到y=x + 3/4 (4)
将(3)代入(4)得到
y=x + 3/4=2m + 7/8
过程应该够详细了,