0.5x+0.7y=35
x+0.4y=40
化简,得 5x+7y=350 ①
5x+2y=200 ②
①－②,得 5y=150
y=30
将y=30代入①,得x=28.
0.5x+0.7y=35,x+0.4y=40.求x=?,y=?
5个回答
相关问题
-
几个两元一次方程,0.5x+0.7y=35x+0.4y=405x+y=2x-3y=43x-2y=12x+3y=-7x/3
-
0.58=(0.5x+0.7y)/(x+y)求X比y怎么求
-
4分之x－y＝﹣1 x＋4y＝4,求x,y 0.2x＋0.5y＝5分之1 0.4x＋0.1y＝5分之2,求x,y
-
已知x、y满足条件7x-5y-23≤0,x+7y-11≤0,4x+y+10≥0,M(2,1),P(x,y).求：1.y+
-
z=0.015x*x+y*x*0.05+(1-x-y)*2.5*(x+y) x>0.35.x
-
1.若4x-3y=0,且x=0,y≠0,求4x+5y分之4x-5y
-
求函数表达式,X=0.5 Y=1X=0.55 Y=0.99X=0.6 Y=0.98X=0,65 Y=0.95X=0.7
-
已知有理数x,y满足0.5‖x-y‖+‖y-0.5‖=0,求3x-7y的值
-
0.2x²y-0.5xy²-0.3x²y+0.7x²y
-
设实数x,y满足x+y-5>0,2x+y-7>0,且x≥0,y≥0