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31点5×5点6 3十一点5×3点4 3十一点五简算

解:依题意得算式, 31.5×4÷(6+3) =126÷9 =14 即315×4÷(6+3)

31点8+2点4×1点五 =31.8+2.4x5x0.3 =31.8+12x0.3 =31.8

3.65×4点7-36点5×0点四七 =3.65×*4.7-3.65*4.7 =3.65*(4.

3.04x31.2/1.98/31.2x1.98 =3.04x31.2x1.98/1.98/31.

4千克苹果=10千克橘子橘子=15.6?(10 3)=1.2元苹果=1.2?5?2=3元

12.5+7.5×3 =12.5+22.5 =35 (0.4+8)×2.5 =0.4×2

31.5÷0.75-2.7 =31.5÷3/4-2.7 =31.5×4/3-2.7 =42-2

31.5×4/25 =63/2×4/25 =126/25

简便计算 31.4×0.15+3.14×0.2+0.314×3 =3.14×1.5+3.14×0

答案: 约等于28.4 解题: 31点5×0点九等于28.35,根据四舍五入的规则,一个数精确

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