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1/5乘6乘7+1/6乘7乘8+1/7乘8乘9+1/8乘9乘10+1/720

1/(5×6×7)+1/(6×7×8)+1/(7×8×9)+1/(7×8×9)+1/720 =[1/(5×6)-1/(6×7)]/2+[1/(6×7)-1/(7×8)]/2+[1/(7×8-1/(8×9)]/2+1/720+1/720 =[1/(5×6)-1/(8×9)]/2+1/360 =1/15-1/36 +1/360 =7/180+1/360 =14/360+1/360 =1/24

5×6乘七分之1 +6乘7×8分之1 +7乘8×9分之1 +8乘9×10分之1 =2分之1×[5×6分之1-6×7分之1+6×7分之1-7×8分之1+7×8分之1-8×9分之1+8×9分之1-9×10分之1] =2分之1 ×(5×6分之1-9×10分之1) =2分之1×(30分之1-90分之1) =2分之1×45分之1 =90分之1

1÷(5*6*7)+1÷(6*7*8)+1÷(7*8*9) =1/7*(1/30+1/48+1/72) =1/7*49/720 =7/720

1/(5×6) + 1/(6×7) + 1/(7×8) = (1/5 - 1/6) + (1/6 - 1/7) + (1/7 - 1/8) = 1/5 - 1/8 = (8 - 5) / (5×8) = 3/40

5乘6分之1加6乘7分之1加7乘8分之1等于 5x1/6+6x1/7+7x1/8 =5/6+6/7+7/8 =1-1/6+1-1/7+1-1/8 =3-(1/6+1/7+1/8) =3-(56+48+42/)336 =3-146/336 =3-73/168 =2, 95/168 在进行分数的简便运算的时候,把分数变形,在分数变形后,分数值要和没变形前的...

1×2×3×4×5×6×7×8×9×10 =1×2×4×8×3×6×9×7×5×10 =1×(2×2×2×2×2×2)×(3×3×3×3)×2×5×7×10 =3628800

1/17+括号5/8+1/7括号乘以八怎么简便计算? 1/17+括号5/8+1/7括号乘以八 =1/17+(5/8+1/7)*8 =1/17+5/8*8+1/7*8 =1/17+5+1+1/7 =6+(1/7+1/17) =6+24/119 =6又24/119

8.9×1.1+15.7×8.9+6.8×1.1 =1.1×(8.9+6.8)+15.7×8.9 =1.1×15.7+15.7×8.9 =15.7(1.1+8.9) =15.7×10 =157

=1/5-1/6+1/6-1/7+1/7-1/8+……+1/49-1/50 =1/5-1/50 =50分之9

两个零。 四个零。 请帮我完成采纳任务!

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