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

1.8
270
3
建议你去买只 CASIO 的学生用计算机 fx-82ES

乘除法是按顺序计算的
(1) 12.6÷5.6×0.8=12.6/5.6*0.8=12.6/7=1.8
(2) 4.5×78÷1.3= 4.5×(78÷1.3)=4.5*60=270
(3) 15.79÷4-3.79×0.25= (3) 15.79*0.25-3.79×0.25=(15.79-3.79)*0.25
=12*0.25=3

(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