www.5129.net > 解方程(1)x+40%x=7(2)120%x%x=7(3)X%x=8.2

解方程(1)x+40%x=7(2)120%x%x=7(3)X%x=8.2

x+40%x=7x+0.4x=71.4x=7x=5120%x-x=71.2x-x=70.2x=7x=35x-18%x=8.2x-0.18x=8.20.82x=8.2x=10

把40%X化成0.4X变成2X+0.4X=7.2 解得2.4X=7.2 X=3 把X=3带入验算6+1.2=7.2 ∵左边=右边 ∴X=3是原方程的解

2x+40%x=7.22.4x=7.2x=7.2/2.4x=35乘以(x-3/1)=2 x-3/1=5/2x=5/2+3/1x=15/11

(1)x-40%x=120 60%x=120 x=200(2)x除以3/4*3/5=8/15 x*4/3*3/5=8/15 x*4/5=8/15 x=2/3

1、x+50%=90 x=90-50%=89.5 2、x-40%x=12 x(1-40%)=12 x=12/60%=203、x-36%x=52 x(1-36%)=52 x=52/64%=81.254、18+8%x=120 8%x=120-18 x=102/8%=12755、19-20%x=7 20%x=19-7 x=12/20%=606. 2/3:x=1/20:3/5 1/20x=2/3*3/5 x=2/5

(1)x+25%x=8 x+0.25x=81.25x=8x=6.4(2)(1-40%)x=6.3 0.6x=6.3x=10.5(3)1/4x5%x=4.8 0.25*0.05x=4.80.0125x=4.8x=384(4)80%x+4.8=200.8x=20-4.80.8x=15.2x=19

①19-120%X=7 1.2x=12x=10②(1-25%)X=36 0.75x=36x=48③3/4X-50%X=17.5 0.25x=17.5x=70④8.5x+1.5=1000% 8.5x=8.5x=1

x一30%x=70.7x=7x=105.2+40%x=7.60.4x=2.4x=6

(1)40%x-2.8=7.6, 40%x-2.8+2.8=7.6+2.8, 40%x=10.4, x=10.4÷40%, x=26,(2)x+20% x=3.6, 1.2x=3.6, x=3.6÷1.2, x=3,(3)90%x-60%x=48 30%x=48, x=48÷30%, x=160.

相关搜索:

网站地图

All rights reserved Powered by www.5129.net

copyright ©right 2010-2021。
www.5129.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com