(1/2-1/3+3/4-4/5)X(-60)=?{1/3-(-1/9+7/12)}X(-36)=?(-61)X36-27X36+12X(-36)=?3 1/2X(-5/7)-(-5/7)X2 1/2-5/7X(-1/2)=?-4/5X(10-1 1/4+0.05)=-8+1-0.04,这个运算运用了( )运算律
问题描述:
(1/2-1/3+3/4-4/5)X(-60)=?
{1/3-(-1/9+7/12)}X(-36)=?
(-61)X36-27X36+12X(-36)=?
3 1/2X(-5/7)-(-5/7)X2 1/2-5/7X(-1/2)=?
-4/5X(10-1 1/4+0.05)=-8+1-0.04,这个运算运用了( )运算律
答
(1/2-1/3+3/4-4/5)X(-60)=-30+20-45+48=-7{1/3-(-1/9+7/12)}X(-36)=(1/3+1/9-7/12)X(-36)=-12-4+21=5(-61)X36-27X36+12X(-36)=36X[(-61)-27-12]=-36003 1/2X(-5/7)-(-5/7)X2 1/2-5/7X(-1/2)=...