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

Toán Lớp 7: 2 tinh a) [(1/8:8/27): -1/3 ] : 81/128 b) (-7/15) x 5 /8 – 15/-7 – (-32)

Toán Lớp 7: 2 tinh a) [(1/8:8/27): -1/3 ] : 81/128 b) (-7/15) x 5 /8 – 15/-7 – (-32)
c) -66 x (1/2-1/3+1/11)+124-(-37)+63x(-124) 3 tim x a) 3/35-(3/5+x)=2/7 b) 3/7+1/7:x=3/14

Comments ( 1 )

  1. Giải đáp:
    ↓↓
    Lời giải và giải thích chi tiết:
    Bài 2:
    a)
    [(18:827):-13]:81128
    =[(18.278).(-3)].12881
    =[2764.(-3)].12881
    = -2
    b)
    (-7/15) xx 5/8 – 15/(-7) – (-32)
    =  (-7/15) xx 5/8 + 15/7 + 32
    = -7/24 + 15/7 + 32
    = 5687/168
    c)
    -66 xx (1/2 – 1/3 + 1/11) + 124 – (-37) + 63 xx (-124)
    = -66 xx 17/66 + 124 + 37 – 63 xx 124
    = -17+ 124 + 37 – 7812
    = -7668
    Bài 3:
    a)
    3/35 – (3/5 + x)  = 2/7
    => 3/35 – 3/5 – x = 2/7
    => x = 3/35 – 3/5 – 2/7
    => x = -4/5
    Vậy x= -4/5
    b)
    3/7 + 1/7 : x = 3/14
    => 1/7 : x = 3/14 – 3/7
    => 1/7 : x = -3/14
    => x = 1/7 : (-3)/14
    => x  = -2/3
    Vậy x=-2/3.

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