20x (40-x)25=930-搜答案-搜狗做题网

x加30%x=521.3x=52x=52×1.3x=40x减40%x=150.6x=15x=15÷0.6x=2550%x加x=31.51.5x=31.5x=31.5÷1.5x=21x减1%x=19.8

1.x+60%x=421.6x=42x=26.252.x-25%x=180.75x=18x=243.3x+20%x=483.2x=48x=1.25纯手打

(1.5X-20)-(X+20+25)=401.5x-20-x-45=400.5x-65=400.5x=40+650.5x=105x=210

两边乘(20+x)(25-x)1000-65x+x²=460+43x+x²108x=540x=5

原方程可化为100*{(X+X*20%)-[(1200-X)-(1200-X)*20%]}=40%*100100*120%X-100*[(1200-X)-(1200-X)*20%]=40120X-10

X+X*20%-(1200-X)-(1200-X)*20%=40%,等式左右同时乘以100得100X+X*20-100*(1200-X)-(1200-X)*20=40120X-(1200-X)*120

(0.2x+25)/(0.8x-25)=5/65(0.8x-25)=6(0.2x+25)4x-125=1.2x+1502.8x=275x=1375/14

25%X+(25%X-5)+20=X50%x+15=x50%x=15x=30

3x-20+4x=x+403x+4x-x=40+206x=60x=10

(x-22)+(x-24)+(x-27)+(x-20)=xx-22+x-24+x-27+x-20=x4x-93=x4x-x=933x=93x=31

(20+2x)(40-x)=1200

(40-x)(20+2x)=1200800+80X-20X-2x^2=1200-2x^2+60X-400=0x^2-30X+200=0(X-10)(X-20)=0X-10=0X-20=0X1=10X2

解方程95+5%x=x95=x-5%x95=0.95xx=95/0.95=100700-40%x=x700=40%x+x700=1.4xx=700/1.4=50060-20%x=x60=20%x+x6

20%x+[25*20%x]+12=50%x+20.2x+5x+12=0.5x+24,7x=-10x=-100/47

x+(3x-16)/25%=40

x+(3x-16)/25%=40两边乘25%0.25x+3x-16=100.25x+3x=10+163.25x=26x=26÷3.25x=8

x-30%x=14x+25%x=20

x-30%x=1470%x=14x=20x+25%x=20125%x=20x=16

等一分钟再答：

（1）X+40%X=28，（1+40%）X=28， &nb

40%x+21=37x=（37-21）÷40%x=40x-78%x=2.2x=2.2÷（1-78%）x=10x+30%x=26x=26÷（1+30%）x=20(1-25%)x=15x=15÷（1-25

25%x+(1-25%)*20%x+6=x

25%x+(1-25%)*20%x+6=x0.25x+0.15x+6=x0.4x+6=xx-0.4x=60.6x=6x=10

各项乘以120得3x+2x+3[20-(x/40+x/60)*8]=3x+15(20-x)2x+60-24(x/40+x/60)=15(20-x)2x+60-0.6x-0.4x=300-15xx+15