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四点3×2点4+2点5×5点七(脱式计算)

4.5×1.2+3.15÷15 =5.46+0.21 =5.67。

6.75×2.4+4.25×2.4-2.4 =(6.75+4.25-1)×2.4 =10×2.4 =24

6.5÷1.3×2.4 =5×2.4 =12

2.5×4.4 =2.5×4×1.1 =10×1.1 =11

五点八四减一点八减三点二三 =5.84-1.8-3.23 =4.04-3.23 =0.81 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

0.48×5.3+0.48×4.7 =0.48×(5.3+4.7) =0.48×10 =4.8

简便计算 4又5/9÷10/23+5又4/9×2.3 =4又5/9×23/10+5又4/9×23/10 =(4又5/9+5又4/9)×23/10 =10×23/10 =23

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

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