17/25X5/37+8/25X17/37+17/37X2/25
=17/25X5/37+17/37(8/25+2/25) (后面部分提出17/37,利用的是乘法分配律)
=17/25X5/37+17/37X10/25
=17/25(5/37+10/37) (提出17/25,利用的是乘法分配律)
=17/25x15/37
=17x15/(25x37) (约分)
=17x3/(5x37)
=51/185
17/25X5/37+8/25X17/37+17/37X2/25
=17/25X5/37+17/37(8/25+2/25) (后面部分提出17/37,利用的是乘法分配律)
=17/25X5/37+17/37X10/25
=17/25(5/37+10/37) (提出17/25,利用的是乘法分配律)
=17/25x15/37
=17x15/(25x37) (约分)
=17x3/(5x37)
=51/185