简便算递等式的485-720÷(15×12)
问题描述：
简便算递等式的485-720÷(15×12)
3.8×4.4+0.44×62
答
485-720÷(15×12)
=485-720÷180
=485-4
=481
3.8×4.4+0.44×62
=3.8×4.4+4.4×6.2
=4.4x(3.8+6.2)
=4.4x10
=44