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

Toán Lớp 8: Tính nhanh: 47² +48² – 25 +94.48

Toán Lớp 8: Tính nhanh: 47² +48² – 25 +94.48

Comments ( 2 )

  1.  472 + 482 – 25 + 94. 48
    = 472 + 2.47. 48 + 482 – 25
    = (47 + 48)2 – 52
    = (47 + 48 – 5)(47 + 48 + 5)
    = (48 + 22)(48 + 52)
    = 90. 100
    = 9000
    —–
    @Tosyyy
    Xin hay nhất

  2. $\text{47² + 48² – 25 + 94 . 48}$
    $\text{= 47² + 48² – 25 + ( 94 . 48 )}$
    $\text{= 2209 + 2304 – 25 + 4512 }$
    $\text{= 4513 – 25 + 4512 }$
    $\text{= 4488 + 4512 }$
    $\text{= 9000 }$
    #banhquyy
     

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