(72+23)乘以(85-27)怎样简便怎样算
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(72+23)乘以(85-27)怎样简便怎样算
![(72+23)乘以(85-27)怎样简便怎样算](/uploads/image/z/14746370-50-0.jpg?t=%2872%2B23%29%E4%B9%98%E4%BB%A5%EF%BC%8885-27%EF%BC%89%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E6%80%8E%E6%A0%B7%E7%AE%97)
(72+23)×(85-27)
= 95×(85-25-2)
= (100-5)×(60-2)
= 100×60 - 2×100 - 5×60 + 5×2
= 6000 - 200 - 300 + 10
= 6000 - 500 + 10
= 5510
再问: 那是小学四年级的题目
再答: 那就改成 (72+23)×(85-27) = 95×(85-25-2) = 95×(60-2) = 95×58 = (100-5)×58 = 100×58 - 5×58 = 5800 - 290 = 5510
= 95×(85-25-2)
= (100-5)×(60-2)
= 100×60 - 2×100 - 5×60 + 5×2
= 6000 - 200 - 300 + 10
= 6000 - 500 + 10
= 5510
再问: 那是小学四年级的题目
再答: 那就改成 (72+23)×(85-27) = 95×(85-25-2) = 95×(60-2) = 95×58 = (100-5)×58 = 100×58 - 5×58 = 5800 - 290 = 5510