Question

1.计算下面各题，能简便计算的要简便计算 125+675÷25×18 13.2-（3.2-2.4-0.45) 4.5×0.5+5.5÷2 3.2×25

1.计算下面各题，能简便计算的要简便计算
125+675÷25×18
13.2-（3.2-2.4-0.45) 4.5×0.5+5.5÷2 3.2×25×1.25
8分之3×7分之15+8分之15×7分之5 1.25÷4×8÷4分之1

Answer 1

125+675÷25×18
=125+(625 +50)/25*18
=125+(25+2)18
=125+450+36
=611
13.2-（3.2-2.4-0.45)
=13.2-3.2+2.4+0.45
=12.85
4.5×0.5+5.5÷2
=0.5*(4.5+5.5)
=5
3.2×25×1.25
=4*25*0.8*1.25
=100*1
=100
8分之3×7分之15+8分之15×7分之5
=3/8*7/15+15/8*5/7
=7/40+75/56
=431/280
1.25÷4×8÷4分之1
=5/(4/4)*8*4
=10