脱式计算(能简算的要简算)5.7+12.95+4.3 135+39+65+11 (480÷16﹣13)×8061.34﹣8.27﹣1.73 7.04﹣2.8+0.96 19.5+4.85﹣8.62.
在○里填运算符号,在□中填数. (1)465﹣199 =465﹣200○□ =□○□ =□ (2)99×33 =(100○□)×33 =100×33○□×33 =□ (3)125×56 =125×(□×□) =125×□×□ =□ (4)3000÷4÷25 =3000÷(□○□) =3000÷□ =□
用简便方法计算. 6.32+7.89+3.6825.23﹣7.8﹣2.2125×(33×8) 49×19+81×497200÷4÷25 78×51﹣78.
下面各题,怎样简便就怎样算. ①0.276×2.5+2.5×2.724②1.25×32×0.25③17.47﹣7.57﹣2.43④3.21+9.46+6.79.
253×46+55×253﹣253.
简便运算 (1)425+636+575+214 (2)125×3×80 (3)5×44×25 (4)123×67﹣123+123×34.