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72000÷(36x25)巧算

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

36x25=(36O4)X(25x口) 36*25=(36*4)*(25*1/4)

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

13753x25 =13753x100/4 =1375300/4 =343825

计算 36x25 =(36÷4)x(25x4) =900

分配律和结合率

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...

36+64x4 48x99 68x102 25x16x125x3 25x25+25x75 =36+256 =48×100-48×1 =68×100+68×2 =(25×16)×(125×3) =25×(25+75) =292 =4800-48 =6800+136 =400×375 =25×100 =4752 =6936 =150000 =2500 48x25x67 =1200×67 =80400 望采纳

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