用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0 求x和y的值
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用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0求x和y的值用代入消元法:5(x+y)-3(x-
用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0 求x和y的值
用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0
用代入消元法:
5(x+y)-3(x-y)=16
3(x+y)-5(x-y)=0 求x和y的值
用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0 求x和y的值
令x+y=m,x-y=n,则
5m-3n=16
3m-5n=0解的m=5,n=3
所以,x+y=5
x-y=3解得x=4,y=1
5a-3b=16
3a-5b=0
a=5b/3
代入 5(5b/3)=16+3b 25b=48+15b b=4.8 则a=9
x+Y=9
X-Y=4.8
Y=2.6
X=7.4
{ X-3Y=5{ (代入消元法){ 2X+4Y=11
用代入消元法:5(x+y)-3(x-y)=16 3(x+y)-5(x-y)=0用代入消元法:5(x+y)-3(x-y)=163(x+y)-5(x-y)=0 求x和y的值
{(1)3X+5Y=21(2)2X-5Y=-11用代入消元法解注意:1.是负112.使用代入消元法
解二元一次方程(用代入消元法){y=2x+3{4x-y=5
解二元一次方程(用代入消元法){x+y=8{5x-2(x+y)=-1
用代入法解下列方程组{x-y-6,2x+3y-8 {3(y-2)=x-17,2(x-1)-5y-8
{3(X-1)=Y+5 5(Y-1)=3(X+5)用代入消元法
用代入消元法3X+4Y=16,5X减6Y等于33
用代入消元法和加减消元法解:x+y=7 5x+3y=31
3x-5y=8,2x-y=1用代入消元法。
用代入法解下列方程组: (1){y=x+1,2x-3y;
求解方程组3x-2y=0,① 7x-3y=10,②(用代入消元法)
3x+4y=16 5x-6y=33(用代入发解方程组)
用代入消元法解方程组 3(y-2)=x-17,2(x-1)=5y-8
解方程组2x-3y=10,-4x+y=-5(用代入法)
用代入法解下列方程 (1) x-y=5 2x+3y=10急11!
用代入法解二元一次方程x-y=42x+y=52x-3y=-44x-5y=32(x-1)-5y=23y-4(x-1)=-3
解方程组:(1)3x+2y=-1,x+4y=-7;(2)x+4y=14,(x-3)/4-(y-3)/3=1/12,用代入消元法(3)(x+y)/2+(x-y)/3=6,2(x+y)-3x+3y=24 用代入消元法