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2.1*12.5*4.8简便算

2.1×(12.5×4)×1.2=2.1×60=126

(1)26.7+3.3×1.2+0.04=26.7+3.96+0.04,=26.7+(3.96+0.04),=26.7+4,=30.7;(2)4.8×12.5×0.8=0.8×12.5×4.8,=10×4.8,=48;(3)2.5×(6+9.728÷3.2)=2.5×(6+3.04),=2.5×9.04,=2.5×(10-0.06),=2.5×10-2.5×0.06,=25-0.15,=24.85...

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

1.25*0.7 +1.25*1.2 +12.5的简便 =1.25x(0.7+1.2)+12.5 =1.25x1.9+12.5 =1.25x2-1.25x0.1+12.5 =2.5+12.5-0.125 =15-0.125 =14.875

0.125*153+12.5*0.25+1.25*2.1 =1.25×15.3+1.25×2.5+1.25×2.1 =1.25×(15.3+2.5+2.1) =1.25×19.9 =1.25×(20-0.1) =1.25×20-1.25×0.1 =25-0.125 =24.875

如图

原式=5/12✖️6=5/2

超级简单,建议你好好学下数据结构

( 1/8+2 /8+3 /8)+(1/5+1/7)-(1/5×1/7)×(35÷7×5)=6/8+1/5+1/7-(1/5×1/7×35)×5/7=3/4+1/5+1/7-5/7=19/20-4/7=53/140

3/2+7/3+7/4 =3/2+1 =1又3/2 9又5/4-2又7/2-1又7/5 =9又5/4-(2又7/2+1又7/5) = 9又5/4-4 =5又5/4 10/4+12/5+10/6 = 10/4+10/6+12/5 =1又12/5 12/5+6/1+12/7+6/5 =12/5+12/7+6/1+6/5 =1+1 =2

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