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

Toán Lớp 7: a) 10 × 1/4 ÷ -3/2 – 29/4 ÷ -3/2 +2 b) 8^3 × 9^3 / 24^3

Toán Lớp 7: a) 10 × 1/4 ÷ -3/2 – 29/4 ÷ -3/2 +2
b) 8^3 × 9^3 / 24^3

Comments ( 2 )

  1. a) 10 × 1/4 ÷ (-3/2) – 29/4 ÷ (-3/2) +2
    =5/2 ÷ (-3/2) – 29/4 ÷ (-3/2) +2
    =(5/2-29/4)÷ (-3/2) +2
    =-19/4÷ (-3/2) +2
    =19/6+2=31/6
    b){8^3 × 9^3} / 24^3
    ={(8 × 9)^3} / 24^3
    ={72^3} / 24^3
    =(72:24)^3
    =3^3=27
     

  2. Giải đáp + Lời giải và giải thích chi tiết:
     a, 10. 1/4 : (-3)/2 – 29/4 : (-3)/2 + 2
    = 5/2 : (-3)/2 – 29/4 : (-3)/2 + 2
    = (5/2 – 29/4) : (-3)/2 + 2
    = -19/4 . (-2)/3 + 2
    = 19/6 + 2
    = 31/6
    b, (8^3 . 9^3)/24^3
    = ((8.9)^3)/24^3
    = 72^3/24^3
    = (72 : 24)^3
    = 3^3 = 27

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