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6.5乘以2.3加上6.5乘以6.7加上6.5的简便计算方法是...

6.5x3.7-2.5x3.7+3.7 =(6.5-2.5+1)x3.7 =5x3.7 =18.5

7.6x2.4+6.5x7.6+7.6+0.76 =7.6x(2.4+6.5+1+0.1) =7.6x(2.4+1+6.6) =7.6x(9+1) =7.6x10 =76

5.5乘以17.3加6.7乘以5.5简便计算 =5.5x(17.3+6.7) =5.5x24 =(5+0.5)x24 =5x24+0.5x24 =120+12 =132

因为4(n-1)n(n+1)=(n-1)n(n+1)(n+2)-(n-2)(n-1)n(n+1) 所以 1*2*3+2*3*4+3*4*5+......+n(n+1)(n+2) =n(n+1)(n+2)(n+3)÷4 1*2*3+2*3*4+3*4*5+4*5*6+5*6*7+6*7*8+7*8*9+8*9*10 =7×8×9×10/4 =1260

5.5乘以17.3加6.7乘以5.5 =5.5×(17.3+6.7) =5.5×24 =132

你这题目有点两种可能,如果,3X4,4X5,这些都在分母上的话就简单了,把所有的7提取出来,然后就是,7X{1/(3x4)+1/(4x5)+...+1/(99x100))}=7x{三分之一减四分之一加四分之一减五分之一加五分之一减六分之一...加九十九分之一减一百分之一}=消...

(36/5+36/7)÷(2/5+2/7) =18×(2/5+2/7)÷(2/5+2/7) =18÷1 =18

5/7乘3/5除以6/7 = 1/2 5/8除以(2/3除以2/5) = 3/8 8/13除以7+1/7乘5/13 = 1/7 48乘(5/6+7/8) = 82 2除以【(1+2/5)乘3/7】 = 10/3 (2/3+1/9)除以(4/5减2/3) = 35/6

=SUMPRODUCT({7,6.5,6}*COUNTIF(B2:AN26,{1,2,3}))

5.2+6.7-5.2+6.7 =(5.2-5.2)+(6.7+6.7) =13.4

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