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25×括号4 2括号用脱式计算怎么写

25×(4+8) =25×4+25×8 =100+200 =300

原式等于 25×4×(125×8) =100×1000 =100000 所以原式的计算结果为100000.

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

原式=4.3+(0.6+6.4) =4.3+7 =5

1/2 2/3×括号3/4-1/6括号除以7/9脱式计算 解: 1/2+ 2/3×(3/4-1/6)除以7/9 =1/2+2/3×7/12÷7/9 =1/2+1/2 =1

解:5/9+(3/4-1/2) =5/9+1/4 =20/36+9/36 =29/36

2/3乘以中括号3/10除以小括号1/3+2/5小括号中括号=2/3*【3/10/(1/3+2/5)】=2/3*【3/10/(11/15)=2/3*9/22=3/11。

三点九除2×括号4.94减3.64等于多少用脱式计算 解: 3.9÷2×(4.94-3.64) =1.95×1.3 =2.535

(4/5-8/15)×1/2÷3/5 =4/15×1/2÷3/5 =2/15÷3/5 =2/9

800减600除以括号2 5乘4括号脱式计算 800-600÷(25x4) =800-600÷100 =800-6 =794

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