75%x-12=(x-12)*37.5%

X/X×（1/12+1/15）×X×（1/12-1/15）=60X/X×9/60×X×1/60=60X/9X/60×X/60=60X×60/9X×X/60=6060/9×X/60=60X/9=60X=

X-25%X=300.75X=30X=30/0.75X=402X+30%X=9.22.3X=9.2X=9.2/2.3X=475%X-45%X=120.3X=12X=12/0.3X=40X+120%X=

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550120x=550x=55/12=4.583

2x(x-1)-x(3x+2)=-x(x+2)-122x^2-2x-3x^2-2x=-x^2-2x-122x^2-3x^2+x^2-2x-2x+2x=-12-2x+12=0-2(x-6)=0x-6=0

1.x-25%x=30X=30/0.75=402.2x+30%x=9.2x=9.2/2.3=43.75%x-45%x=12x=12/0.3=404.x+120%x=33x=33/2.2=15再问：能讲

5x+35=140-2x5x+2x=140-357x=105x=159x-27=70+4x9x-4x=70+275x=97x=97/512+7x=2x+327x-2x=32-125x=20x=4250

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

0.2x+0.4x=120.6x=12x=12÷0.6x=2020x+x=42021x=420x=420÷21x=20

每个绝对值里都是正数所以原式=x+1+x+3+x+5+……+x+13-x-2-x-4-x-6-……-x-12=x-1*6+13=x+7=π/2+7

同时乘6060×（x/15+x/12+x/10）=1365×604x+5x+6x=8190015x=81900x=81900÷15x=5460很高兴为您解答,【学习宝典】团队为您答题.请点击下面的【选

x-o.8x=6X=3012x-8x=4.8X=1.23x-8=16X=8x-0.7x=3.6X=127.5x-2x这题没有=

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

x/2+x/6+x/12+x/20+x/30+x/42=136x/42=1x=7/6

(x+12)*(x+12)=x*x+360x*x+144+24x=x*x+36024x=360-144=216x=216/24=9楼下的你复制我的做什么

(3x/24+2x/24)*3+(2x/24+x/24)y=x15x/24+3xy/24=x15x+3xy=24x9x-3xy=03x-xy=0x(3-y)=0结果：x=0或y=3

应该是-2x²,不是-3x²3x²-x=1原式=9x^4-3x³+15x³-5x²+3x²-7x+2001=3x²(3x

7x-12%=5.87x=2.8+1.27x=4x=4/725+75%x=32.50.75x=32.5-250.75x=7.5x=1080%x-46%x=10.20.34x=10.2x=10.2÷0.

=x^2+10x-24+x^2+15x+56-x^2+5x+50=x^2+30x+82=4+60+82=146其实,不化简,直接代入=14*0+9*10+7*8=0+90+56=146也很简单

原方程化为：（1/2+1/6+1/12+1/20+1/30+1/42)x=6【(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)】x=6