56x0.18+18%x44简便运算 x-60%x=18 5分之3x+2.5x8=95 40%x+30=80 35%x-20%x=30 解方程x-60%x=18 5分之3x+2.5x8=95 40%x+30=80 35%x-20%x=30

问题描述:

56x0.18+18%x44简便运算 x-60%x=18 5分之3x+2.5x8=95 40%x+30=80 35%x-20%x=30 解方程
x-60%x=18 5分之3x+2.5x8=95
40%x+30=80 35%x-20%x=30

0.18×(56+44)=0.18×100=18
5分之3X=75 X=125
0.4X=50 X=125
0.15X=30 X=200

56x0.18+18%x44=56x0.18+0.18x44=(56+44)x0.18=100x0.18=18
x-60%x=18 x-0.6x=18 x(1-0.6)=18 0.4x=18 x=45
(3/5)x+2.5x8=95 (3/5)x+2.5x4x2=95 (3/5)x+10x2=95 (3/5)x+20=95 (3/5)x=75 x=125
40%x+30=80 40%x=50 0.4x=50 x=125
35%x-20%x=30 (35%-20%)x=30 15%x=30 0.15x=30 15x=3000 x=200

简便计算:
1)
56×0.18+18%×44
=56×0.18+0.18×44
=(56+44)×0.18
=100×0.18
=18
解方程:
1)
x-60%x=18
0.4x=18
x=45
2)
3/5x+2.5×8=95
3/5x+20=95
3/5x=75
x=125
3)
40%x+30=80
0.4x=50
x=125
4)
35%x-20%x=30
0.15x=30
x=200