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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: bài 1 : tìm số nguyên X biết `a/24=1/72+25/36` bài 2 : tìm x biết A ) `x-3/7=-5/8` B )

Toán Lớp 6: bài 1 : tìm số nguyên X biết
a/24=1/72+25/36
bài 2 : tìm x biết
A ) x-3/7=-5/8 B ) -4/25-x=-3/5
bài 3 : chứng tỏ
B = 1/2^2+1/5^2+1/6^2+1/7^2+1/8^2<1

Comments ( 1 )

  1. 1/72+25/36=17/24

    =)a=17

    2a)

    x=-(5/8)+3/7

    x=-(11/56)

    b)x=-(4/25)–(3/5)

    x=11/25

    3)Vì :

    1/2^2;1/5^2;1/6^2;1/7^2;1/8^2<1

    =)B<1

     

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222-9+11+12:2*14+14 = ? ( )