Question

0.6+17.9×5分之3+ 60% ×31-1的简便运算是什么？

Answer 1

0.6+17.9×3/5+60%×31-1
=0.6×(1+17.9+31)-1
=0.6×(50-0.1)-1
=0.6×50-0.6×0.1-1
=30-0.06-1
=28.94