解方程:1.98%x=(1000-x)2.15‰x12x(1-20%)

问题描述:

解方程:1.98%x=(1000-x)2.15‰x12x(1-20%)

2.15‰x12x(1-20%)
=0.00215×12×0.8
=0.02064
0.0198X=(1000-X)×0.02064
1980X=2064000-2064X
4044X=2064000
X≈510.386.