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脱式计算能简算的要简算5.5x2.3 1.7x5.5怎么算

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。

=((1x5x7x8x10)x(2x11)x(3x9)x(4x6))/(27x25x24x22) =2800/25 =112

原式 =6.5x(2.3+1.7) =6.5x4 =6x4+0.5x4 =24+2 =26

7.2x5.3+ 7.2x4.6+ 7.2x0.1 =7.2x(5.3+4.6+0.1) =7.2x10 =72

5.2×3.2+7.8x5.2一5.2 =5.2×(3.2+7.8-1) =5.2x10 =52

1' 原式等于1/2*2/3*3/4*4/5*……*2011/2012,前项的分母和后项的分子约分后等于1/2012

用简便方法计算。 (1)5分之6X13分之7一13分之7X5分之1 =(6/5-1/5)×7/13 =1×7/13 =7/13 (2)3分之2X51X2分之15 =(2/3×15/2)×51 =5×51 =255 (3)25X6分之5一6分之5 =(25-1)×5/6 =24×5/6 =20 (4)99X98分之97 =(98+1)×97/98 =98×97/98...

7/5×2/3+14/15÷1/9 =14/15×1+14/15×9 =14/15×(1+9) =14/15×10 =140/15 =28/3

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