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2.5X1.9X0.4的简便计算

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

=2/5x(1/10+9/10)=2/5x1=2/5

2.5x3.8x0.4x0.2 =(2.5x0.4)x(3.8x0.2) =1x0.76 =0.76 6.5xl.9一6.5x0.9 =6.5x(1.9-0.9) =6.5x1 =6.5 2.7X10.2 =2.7x10+2.7x0.2 =27+0.54 =27.54 9.8X25 =10x25-0.2x25 =250-5 =245 供参考。

7.5=2.5×3 22.5=2.5×9 所以就变成 2.5×(3×2.3+1.9+9×0.4)=2.5×(6.9+1.9+3.6)=25×12.4=31

4.25x9.9+4.25x0.1 =4.25*(9.9+0.1) =4.25*10 =42.5

a+b≥2√ab是对的,但是(4/x)*(9/(1-x))并不是常数值,所以即使4/x和9/(1-x)不相等,4/x+9/(1-x)也可以比x=4/13时校 所以应该用的不等式是:(a²+b²)(x²+y²)>=(ax+by)²,当且仅当a/x=b/y时等号成立 所以(4/x+9/(1-x))(x +...

=10.1x9.4-10x9.4 =9.4x(10.1-10) =9.4x0.1 =0.94

(1)9.81X9.8=9.81*(10-0.2)=9.81*10-9.81*0.2=98.1- 1.962=96.138 (2)0.027+9.9X0.27=0.027*(1+99)=2.7 (3)感觉这个已经很简便了小朋友,13.4-0.4X3=13.4-1.2=12.2

在二项分布中,X≥1和X=0是对立事件,概率相加等于一。就可以求解啦

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