Question

4.25除以2.5乘以99加1.7简便运算.

Answer 1

4.25÷2.5×99 +1.7
=4.25÷10/4 ×99+1.7
=425/100 ×4/10 ×99+1.7
=1700/1000×99+1.7
=1.7×99+1.7
=1.7×(99+1)
=1.7×100
=170