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72000÷(36x25)巧算

72000 ÷ (36 × 25) = 72000 ÷ (4 × 25 × 9) = 72000 ÷ 100 ÷ 9 = 720 ÷ 9 = 80

利用乘法分配律和特殊数的乘积进行简便计算。 (36+36×3)×25 =(36×1+36×3)×25 =36×(1+3)×25 =36×(4×25) =36×100 =3600

36x25-25x20+16x75 = 36x25-25x20+16x25X3 =36x25-25x20+25X48 =25X(36-20+48) =25X64 (=25X4X16)个人觉得这一步可要可不要·、 =1600

36×25 =9×(4×25) =9×100 =900

27x24-3x36x25÷(100÷14) =648-108x25÷100x14 =648-2700÷100x14 =648-27x14 =648-378 =270

计算 36x25 =(36÷4)x(25x4) =900

简便计算 (25X62-26X25)÷18 =(25x62-25x26)÷18 =25x(62-26)÷18 =25x36÷18 =25x(36÷18) =25x2 =50

76x25-36x25 =(76-36)x(25) =(40)x(25) =(1000)

36x25十63x25十25 =(36+63+1)x25 =100x25 =2500

63x25+25x36+25 =25×(63+36+1) =25×100 =2500 乘法分配律:两个数的和与一个数相乘,可以先把它们分别与这个数相乘,再相加,得数不变,这叫做分配律。 图形表示:(△+☆)×□=△×□+☆×□ 字母表示:(a+b)×c=a×c+b×c 变式:(a-b)×c=a×c-b×c 例如...

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