5436乘以5438减5435乘以5439简算

5436乘以5438减5435乘以5439简算 4.2乘以1.2减5.2乘以0. 72乘以2.09减1.8乘以73.6 (-7)乘以(-11)减12乘以(-8) 2000乘以1999减1999乘以1998加1998乘以1997减1997乘以1996,简算 9.8乘以65.2乘以1.25减12.5乘以0.625乘以18怎样简算 【2009乘以2008减2008乘以2008】乘以0.01乘以0.01 25乘以?乘以?等于（?乘以12）乘以（?乘以? 20乘以20减19乘以19加18乘以18减17乘以17加...加2乘以2减1乘以1的结果 3乘以a乘以b的平方加6乘以a的平方乘以b减3乘以a乘以b的因式分解 99乘以99减98乘以98怎样简便运算 134乘以56减134加45乘以134 24乘以多少减多少乘以15等于18 52乘以11.1减2.6乘以77.8简算 99乘以98减98乘以97加96乘以95减95乘以94加.加6乘以5减5乘以4加3乘以2减2乘以1等于多少 0.26乘以9.8减0.74乘以0.2的简便运算、 1.2乘以1.25减0.2乘以1.25怎样简便计算 256乘以9减46乘以9简便计算