5x-40=20解方程
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(5x-20)=2(x+20)去括号:5X-20=2X+40移项:5X-2X=40+20合并同类项:3X=60系数化为1:X=20
5+3x=17.6-x3x+x=17.6-54x=12.6x=12.6/4x=3.15
10x+5(40-x)=27510x+200-5x=2755x=75x=15
40%x+20=500.4x+20=500.4x=30x=75
4x-3(20-x)=5x4x-60+3x=5x2x=60x=30
x+3/20x=4623x/20=46x=46x20/23=40,x-1/5x=404x/5=40x=200/4=50,x-1/2x=3/4x/2=3/4x=3/2,x-0.2x=180.8x=18x
5/4x-12.6=40%x1.25x-0.4x=12.60.85x=12.6x=12.6÷0.85
(x-40)×20%=1/5(x-40)×1/5=1/5x-40=1x=41
3x-20+4x=x+403x+4x-x=40+206x=60x=10
5x+20=25;5x=5;x=1;
(x-40)(x+20)=-1200x^2-20x-800=-1200x^2-20x+400=0因为△=(-20)^2-4*400=-3*400
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
(x-40)=5/7xx-40=5/7xx-5/7x=402/7x=40x=140
再答:满意吗再问:嗯
等一分钟再答:
(1)X+40%X=28, (1+40%)X=28, &nb
5x=40-205x=20x=4
你懒惰了,通分得:50x=300x=6
5×+2.6×5=20
(40%-20%)x=16[(40/100)-(20/100)]x=16[(40-20)/100]x=16[20/100]x=16x=16[100/20]x=1600/20x=80