脱式计算。(能简算的简算) (20+8.5)÷15 (2.3÷0.46-4.5)÷0.25

2020-09-23 社会 201阅读
(20+8.5)÷15
=28.5÷15
=1.9
(2.3÷0.46-4.5)÷0.25
=(5-4.5)÷0.25
=0.5÷0.25
=2
2.65×1.7+1.35×1.7
=1.7×(2.65+1.35)
=1.7×4
=6.8
4.8×0.9+0.48
=4.8×0.9+4.8×0.1
=4.8×(0.9+0.1)
=4.8×1
=4.8
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