x-20%=4.8-搜答案-百度作业网

（20-2x)(20-2x)x>400400-80x+4x²>400x²-20x＞0x(x-20)＞0x＜0x＞20

(x+20)/7+x/4.8=45

(x+20)/7+x/4.8=45(x+20)/7+5x/24=4524(x+20)+7*5x=45*7*2439x+24*5*4=5*9*7*2439x+120*4=120*6339x=120*63

（x-3.6)/4=(x+4.8)/8则2(x-3.6)=x+4.82x-7.2=x+4.8x=12

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

x+(20-x)=56

x+(20-x)=56x+20-x=5620=56所以原方程无解

x-3(20-x)=3x-7(9-x)

x-60+3x=3x-63+7x4x-60=10x-634x-60+63=10x4x+3=10x3=10x-4x3=6xx=1/2

X-20％X=12

X-20％X=120.8x=12x=15再问：为什么是0.8X？再答：X-20％X=﹙1－0.2﹚x=0.8x

x-20%x=4.8怎样算?

x-0.2x=4.8x（1-0.2）=4.80.8x=4.8x=6

2x-1.4=4.8(1/8)x+1/16=3/472-4x=605x-0.2x=19.22x=4.8+1.4(1/8)x=3/4-1/164x=72-604.8x=19.22x=6.2(1/8)x=

11.5x+x=20

11.5X+X=20(11.5+1）X=2012.5X=20X=20÷12.5X=1.6

x/2+x/8+x/12+x/20=1

60X+15X+10X+6X=12091X=120X=120/91

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

各分式减1,得1/（x+2004)+1/(x+2006)=1/(x+2007)+1/(x+2003),通分得（2x+4010)/[（x+2004)(x+2006)]=(2x+4010)/[(x+200

x-20%x=4

x-20%x=40.8x=4x=4÷0.8x=5

0.88（X+20%X)=X+84

0.88x+0.88*20%x=x+841.056x=x+84x=1500

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

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

x-56=20%x

x-56=20%xx-56=0.2xx-0.2x=560.8x=56x=56÷0.8x=70很高兴为您解答,【the1990】团队为您答题.请点击下面的【选为满意回答】按钮.

60%x+91=1030.6x=103-910.6x=12x=20x-20%x=4.8x-0.2x=4.80.8x=4.8x=613%x-19=70.13x=19+70.13x=26x=200

X/(X+255)=20%

X/(X+255)=20%化成比例的形式：X:(X+255)=1:5由比例的基本性质,得：5x=x+255即4x=255x=63.75