tính nhanh : a,( 1 – 1/2 ) x (1 – 1/3 ) x ( 1- 1/4 ) x (1 -1/5 ) x ( 1 – 1/6 ) x ( 1 – 1/7 )

Question

tính nhanh :
a,( 1 – 1/2 ) x (1 – 1/3 ) x ( 1- 1/4 ) x (1 -1/5 ) x ( 1 – 1/6 ) x ( 1 – 1/7 )

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Alexandra 5 phút 2021-10-06T08:54:37+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-10-06T08:55:55+00:00

    (1 – 12) x (1 – 13) x (1 – 14) x (1 – 15) x ( 1 – 16) x (1 – 17)

     12 x 23 x 34 x 45 x 56 x 67

    = 1.2.3.4.5.62.3.4.5.6.7 

    = 17

          CHÚC BẠN HỌC TỐT

    0
    2021-10-06T08:56:35+00:00

    Đáp án:

     

    Giải thích các bước giải

    (1 – $\frac{1}{2}$) x (1 – $\frac{1}{3}$) x (1 – $\frac{1}{4}$) x (1 – $\frac{1}{5}$) x ( 1 – $\frac{1}{6}$) x (1 – $\frac{1}{7}$)

    =  $\frac{1}{2}$ x $\frac{2}{3}$ x $\frac{3}{4}$ x $\frac{4}{5}$ x $\frac{5}{6}$ x $\frac{6}{7}$

    = $\frac{1.2.3.4.5.6}{2.3.4.5.6.7}$ 

    = $\frac{1}{7}$

    Tick mình nha! 

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