x÷0.8-0.75=0.75解方程解方程
解方程x+40%x=77040%x-20%x=7.8x+20%x=6.61-25%x=0.75....
解方程
x+40%x=770
40%x-20%x=7.8
x+20%x=6.6
1-25%x=0.75. 展开
x+40%x=770
40%x-20%x=7.8
x+20%x=6.6
1-25%x=0.75. 展开
展开全部
①x+40%x=770
1.4x=770
1.4x÷1.4=770÷1.4
x=550
②40%x-20%x=7.8
0.2x=7.8
0.2x÷0.2=7.8÷0.2
x=39
③x+20%x=6.6
1.2x=6.6
1.2x÷1.2=6.6÷1.2
x=5.5
④1-25%x=0.75
1-0.25x+0.25x=0.75+0.25x
0.75+0.25x-0.75=1-0.75
0.25x=0.25
0.25x÷0.25=0.25÷0.25
x=1
1.4x=770
1.4x÷1.4=770÷1.4
x=550
②40%x-20%x=7.8
0.2x=7.8
0.2x÷0.2=7.8÷0.2
x=39
③x+20%x=6.6
1.2x=6.6
1.2x÷1.2=6.6÷1.2
x=5.5
④1-25%x=0.75
1-0.25x+0.25x=0.75+0.25x
0.75+0.25x-0.75=1-0.75
0.25x=0.25
0.25x÷0.25=0.25÷0.25
x=1
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询