200.3乘以20.5-20.3乘以204这道题怎么做?

Question

200.3乘以20.5-20.3乘以204 这道题怎么做?

Answer 1

200.3乘以20.5-20.3乘以204
=200.3乘以20.5-20.3乘以20.5-20.3×183.5
=（200.3-20.3）×20.5-20.3×183.5
=180×20.5-20.3×108-20.3×3.5
=180×（20.5-20.3）-20×3.5-0.3×3.5
=180×0.2-70-1.05
=36-71.05
=-35.05