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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![计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)](/uploads/image/z/54014-14-4.jpg?t=%E8%AE%A1%E7%AE%97%E9%A2%98%EF%BC%9A%EF%BC%881%EF%BC%8948%2A1.08%2B1.2%2A56.8+%EF%BC%882%EF%BC%8972%2A2.09-1.8%2A73.6+%EF%BC%88%E8%A6%81%E5%B7%A7%E7%AE%97%EF%BC%89)
计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)
计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)
计算题:(1)48*1.08+1.2*56.8 (2)72*2.09-1.8*73.6 (要巧算)
(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