有理数乘法:1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)=
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![有理数乘法:1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)=](/uploads/image/z/2538667-19-7.jpg?t=%E6%9C%89%E7%90%86%E6%95%B0%E4%B9%98%E6%B3%95%EF%BC%9A1%E3%80%81%EF%BC%88-15%EF%BC%89%2A%EF%BC%88%2B38%EF%BC%89%2B%EF%BC%88-15%EF%BC%89%2A%EF%BC%88-30%EF%BC%89%2B%EF%BC%88-7%EF%BC%89%2A%EF%BC%88-50%EF%BC%89-%EF%BC%88-7%EF%BC%89%2A%EF%BC%88-40%EF%BC%89%3D)
有理数乘法:1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)=
有理数乘法:1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)=
有理数乘法:1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)=
1、(-15)*(+38)+(-15)*(-30)+(-7)*(-50)-(-7)*(-40)
=-15*(38-30)+7*(50-40)
=-15*8+7*10
=-120+70
=-50
-50