计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)

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2024-11-27 04:20:47
推荐回答(3个)
回答1:

1)48*1.08+1.2*56.8=40*1.2*1.08+1.2*56.8=1.2*(43.2+56.8)=108 2)72*2.09-1.8*73.6=1.8*40*2.09-1.8*73.6=1.8*(83.6-73.6)=18

回答2:

(1)、
48×1.08+1.2×56.8
=12×4×1.08+1.2×5.68×10
=12×4×1.08+12×5.68
=12×﹙4×1.08+5.68﹚
=12×﹙4.32+5.68﹚
=12×10
=120
(2)、
72×2.09﹣1.8×73.6
=18×4×2.09﹣1.8×7.36×10
=18×4×2.09﹣18×7.36
=18×﹙4×2.09﹣7.36﹚
=18×﹙8.36﹣7.36﹚
=18×1
=18

回答3:

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