(20.2×0.4+7.88)÷4.2 【能巧算就巧算,
问题描述:
(20.2×0.4+7.88)÷4.2 【能巧算就巧算,
答
(20.2×0.4+7.88)÷4.2
=(8.08+7.88)÷4.2
=15.96÷4.2
=3.8