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

Toán Lớp 6: Tính Nhanh 3 x 5² – 15 x 2² + 32 . 2010⁰ giúp mình vs ạ

Toán Lớp 6: Tính Nhanh
3 x 5² – 15 x 2² + 32 . 2010⁰
giúp mình vs ạ

Comments ( 2 )

  1. $\\$
    3 × 5^2 -15 × 2^2 + 32 × 2010^0
    = 3 × 5 × 5 – 15 × 4 + 32 × 1
    = (3×5) × 5 – 15 × 4 + 32
    = 15 × 5 -15 × 4 + 32
    = 15 × (5-4) +32
    = 15 × 1 + 32
    = 15 + 32
    = 47

  2. 3 xx 5^2 – 15 xx 2^2 + 32 . 2010^0
    = 3 xx 25 – 15 xx 4 + 32 xx 1
    = 3 xx 5 xx 5 – 15 xx 4 + 32
    = 15 xx 5 – 15 xx 4 + 32
    = 15 xx ( 5-4) + 32
    = 15 xx 1 + 32
    = 15 + 32
    = 47
     

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

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