997乘以7+216巧算

997乘以7+216巧算 2乘以3乘以5乘以7乘以11乘以13乘以17除以（2004-2）等于多少 巧算、要巧算. 1乘以2乘以3+2乘以3乘以4+3乘以4乘以5+...+7乘以8乘以9 巧算25乘以5乘以64乘以125怎么做? 巧算:17分之5乘以24分之9+17分之9乘以24分之7 9乘以808乘以125巧算 9999乘以7加1111乘以37 (-4)乘以（-7）乘以（-25)= 7乘以15乘以四怎么算 1.25乘以7乘以80.8怎么简便? (-7)乘以(-11)减12乘以(-8) 79乘以12.5巧算 3333333333乘以9999999999巧算 巧算 6666乘以4444 12.3乘以0.99 巧算 216乘以62等于 1000乘以999乘以998乘以997……乘以1等于多少? 7乘以8表示