30+20x=90-10x
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30+20x=90-10x30+20x=90-10x30+20x=90-10x解:20X+10X=90-3030X=60X=2
30+20x=90-10x
30+20x=90-10x
30+20x=90-10x
解 :
20X+10X=90-30
30X=60
X=2
30+20x=90-10x
求几道解方程数学题60%x+25=40 x+30%x=52 19-120%x=7 x-10%x=18 (1-25%)x=362x+30%x=9.260%x+90=102 x-20%=5.2 50%x+3x=28 9.1-14%x=0.7
X-30%X+8-X=20
30%x=50%x-20x
80%x+30-x=10%x
x(x-20)=x+10
30%x=20%【10+x]
20%x+20%x×30%x-20%x=4.5
X×X-(X-10)(X-10)=30×30
x+2x+(x+10)=90,x=?
50%x+x=20 x+30%x=52
x-30%x=14x+25%x=20
x/6+x/12+x/20+x/30=1
(30-x):(18+x)=(20+x):(32-x)
30(x+5)=26x+10x(x+5)
x-10+X+20+X/2+2X=370
x+(x+20)+(x-10)+70+x=540 .
x+10+x-20+2x+x/2=370