脱式计算，能简算的要简算．0.265×1.7+1.35×0.1723.4÷7.8-2.10.75×18÷0.152.5×3.2×1.253.7×91.6+5.3×91.6+91.616.84÷40÷0.25

Question

脱式计算，能简算的要简算．

0.265×1.7+1.35×0.17	23.4÷7.8-2.1	0.75×18÷0.15
2.5×3.2×1.25	3.7×91.6+5.3×91.6+91.6	16.84÷40÷0.25

Answer 1

（1）0.265×1.7+1.35×0.17    
=2.65×0.17+1.35×0.17 
=（2.65+1.35）×0.17
=4×0.17
=0.68

（2）23.4÷7.8-2.1
=3-2.1
=0.9

（3）0.75×18÷0.15
=13.5÷0.15
=90

（4）2.5×3.2×1.25   
=2.5×4×0.8×1.25         
=（2.5×4）×（0.8×1.25）
=10×1
=10

（5）3.7×91.6+5.3×91.6+91.6
=（3.7+5.3+1）×91.6
=10×91.6
=916

（6）16.84÷40÷0.25
=16.84÷（40×0.25）
=16.84÷10
=1.684