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简便计算题大全四年级198/23

198×23要简便运算 198×23 =23*(200-2) =23*200-23*2 =4600-46 =4554

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

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

1.198×23 =(1.2-0.002)×23 =1.2×23-23×0.002 =23+23×0.2-0.046 =23+0.46-0.046 =23.46-0.046 =23.414

198x36 =(200-2)x36 =200x36-2x36 =7200-72 =7128

g

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

198÷23 =(23×8+4)×23分之1 =23×8×23分之1+4×23分之1 =8+23分之4 =8又23分之4

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