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简便计算题大全四年级198/23

198×23 =(100+90+8)×23 =100×23+90×23+8×23 =2300+2070+184 =4370+184 =4550

198╳23 =(200-2)╳23 =200╳23-2╳23 =4600-46 =4554 ;;;

198x23 =(200-2)x23 =200x23-2x23 =4600-46 =4554

23×13减198除以十八的简便运算 =23x(10+3)-11 =230+69-11 =288

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