x+y=42 0.8%x+1.1%y=42*1%「解方程组

来源：学生作业帮助网编辑：六六作业网时间：2024/11/28 14:18:19

x+y=420.8%x+1.1%y=42*1%「解方程组x+y=420.8%x+1.1%y=42*1%「解方程组x+y=420.8%x+1.1%y=42*1%「解方程组x+y=42=>y=42-x0.

x+y=42 0.8%x+1.1%y=42*1%「解方程组
x+y=42 0.8%x+1.1%y=42*1%「解方程组

x+y=42 0.8%x+1.1%y=42*1%「解方程组
x+y=42 => y=42-x
0.8%x+1.1%y=42*1% => 8x+11y=420
=> 8x+11(42-x)=420
=> (11-8)x=(11-10)*42
=> 3x=42
=> x=14
=> y=42-x=28
∴x=14,y=28

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 化简 x / y(x+y) - y / x(x+y) = 7x:4y,x:y=( ):( (x-4y)(2x+y)= 5x-4y(y-x)=? x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x+x+x+y=60 .x-y=4 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? x+y=11 2x+4y=42 3y+x=31 求x y x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? {X+2Y/2+3X-Y/3=5{0.2(X+2Y)+0.8(3X-Y)=4 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x y=x(x 3X+X=( ) Y+4Y-3Y=( ) x+y／y=5／4,则x／y=---------------- x*x+2x+y*y-4y+5=0 x= y=