解方程,x-10%x=2.7 x+20%x=24 30%+10%x=6.2 x+30%x=2.6x-10%x=2.7 x+20%x_数学解答

解方程,x-10%x=2.7 x+20%x=24 30%+10%x=6.2 x+30%x=2.6
x-10%x=2.7 x+20%x=24 30%+10%x=6.2 x+30%x=2.6

人气：483 ℃　时间：2020-03-23 14:25:25

解答

x-10%x=2.7
x-0.1x=2.7
0.9x=2.7
x=3
x+20%x=24
x+0.2x=24
1.2x=24
x=20
30%+10%x=6.2
0.1x=6.2-0.3
0.1x=5.9
x=59
x+30%x=2.6
x+0.3x=2.6
1.3x=2.6
x=2