脱式计算.三克油.
问题描述:
脱式计算.三克油.
2.5×4.4 (2分之3+3分之5)÷4分之15-5分之2
答
(1)
2.5×4.4
=2.5×(4+0.4)
=2.5×4+2.5×0.4
=10+1
=11
(2)
(3/2+5/3)÷15/4-2/5
=3/2×4/15+5/3×4/15-2/5
=2/5+4/9-2/5
=4/9