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脱式计算(能简算的,要简算) (2/5加1/3)乘以15 8/9乘2

①3 13 15 -2 13 14 +5 2 15 -1 1 14 ,=(3 13 15 +5 2 15 )-(2 13 14 +1 1 14 ),=9-4,=5;②14.85-1.58×8+31.2÷1.2,=14.85-12.64+26,=2.21+26,=28.21;③(1 1 3 +2 1 2 )÷(2-1 1 2 ),= 23 6 ÷ 1 2 ,=7 1 2 ;④2.25× 3 5 +2.75÷1 2...

答案是:119,1486,184,18,691,24

未完

5.5x2.3+1.7x5.5 =5.5x(2.3+1.7) =5.5x4 =22 朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

⑴1/4÷(2/3-3/2×1/3)=3/2 ⑵24×(1/6+3/8+7/12)=27 ⑶1/8×58+1/8×41+1/8=25/2

18乘括号1/2加1/3加2/9 =18乘(9/18加6/18加4/18) =18乘19/18 =19

4-[3.75×(1.2-1/3)+3/4] =4-[3.75×(6/5-1/3)+3/4] =4-15/4×(18-5)/15-3/4 =4-15/4×13/15-3/4 =4-13/4-3/4 =4-4 =0

第一题2-3分之2*5分之3+2分之1÷4分之3 =2-(2/3)×(3/5)+(1/2)×(4/3) =2-2/5+2/3 =2-6/15+10/15 =2+4/15 =2又15分之4; 第二题 【0.25*76+23*25%+4分之1】÷0.01 =(0.25×(76+23+1))÷0.01 =0.25×100÷0.01 =2500; 第三题【3分之1+(5.4-3分之2*3分之2...

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