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

Toán Lớp 8: Tính nhanh: $48^{2}$- $42^{2}$ +64-$52^{2}$

Toán Lớp 8: Tính nhanh:
$48^{2}$- $42^{2}$ +64-$52^{2}$

Comments ( 2 )

  1. $48^2-42^2+64-52^2$
    $=(48^2-52^2)-42^2+64$
    $=(48-52)(48+52)-(42-8)(42+8)$
    $=-4.100-34.50$
    $=-50(8+34)$
    $=-50.42$
    $=-2100$
     

  2. 38^2 – 42^2 + 64 – 52^2
    = (48^2 – 52^2) – (42^2 – 38^2)
    = (48+52)(48−52)−(42+8)(42−8)
    = = − 4.100 − 50.34
    = − 8.50 − 50.34 
    = 50 ( − 8 − 34 )
     = 50. ( − 42 ) = − 2100

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

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