x-3y=4 5-2x+9y=?
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x-3y=45-2x+9y=?x-3y=45-2x+9y=?x-3y=45-2x+9y=?5-2x+9y=5-(2x-9y)=5-2(x-3y)=5-2×4=-3确定没抄错吗ls5-(2x-9y)=5
x-3y=4 5-2x+9y=?
x-3y=4 5-2x+9y=?
x-3y=4 5-2x+9y=?
5-2x+9y=5-(2x-9y)=5-2(x-3y)=5-2×4=-3
确定没抄错吗
ls 5-(2x-9y)=5-2(x-3y 一看就不对
改个数才对
0
利用代入法
x=4-3y带入另一个式子
得到 5-4-3y+9y=0
1+6y=0
y=-1/6
x=9/4
X=4+3Y 5-2(4+3Y)+9Y=5-8-6Y+9Y=3Y-3或X-7
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
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x+y=5 2x+3y-z=9 x-y+z=4
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
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