题目内容：

简便计算：(1) 12.6÷5.6×0.8 (2) 4.5×78÷1.3 (3) 15.79÷4-3.79×0.25

优质解答

(1)12.6÷5.6×0.8
=2.25×0.8
=1.8
(2)4.5×78÷1.3
=351÷1.3
=270
(3)15.79÷4-3.79×0.25
=15.79× 1 -3.79×1
- -
4 4
=1
- ×（15.79-3.79）
4
=1
- ×12
4
=3