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

Toán Lớp 6: Tính nhanh : a) 124 + (-52) . 124 + 124 . 47 b) ( -55) . 78 + 13 . ( -78) – 65 . (-78) c) ( 135-35) . (-47) + 53 . (-48 – 52) d) 25.( 7

Toán Lớp 6: Tính nhanh :
a) 124 + (-52) . 124 + 124 . 47
b) ( -55) . 78 + 13 . ( -78) – 65 . (-78)
c) ( 135-35) . (-47) + 53 . (-48 – 52)
d) 25.( 75- 49) + 75. ( 49-25)

Comments ( 2 )

  1. $\text{ a) 124 + (-52) . 124 + 124 . 47 }$
    $\text{ = 124 × ( -52 + 1 + 47 ) }$
    $\text{ = 124 × ( – 4 ) }$
    $\text{ = -496 }$
    $\text{ b) ( – 55 ) . 78 + 13 . ( – 78 ) – 65 . (- 78 ) }$
    $\text{ = – 78 × ( 55 + 13 – 65 ) }$
    $\text{ = – 78 × 3 }$
    $\text{ = -234 }$
    $\text{ c) ( 135 – 35 ) . ( – 47 ) + 53 . ( – 48 – 52 ) }$
    $\text{  =  100 × – 47 + 53 × (  – 100  )}$
    $\text{ = – 4700 – 5300 }$
    $\text{ = – 10000 }$
    $\text{ d) 25 . ( 75 – 49 ) + 75 . ( 49 – 25 ) }$
    $\text{ = 25 × 26 + 75 × 24 }$
    $\text{ = 650 + 1800 }$
    $\text{ = 2450 }$

  2. \text{Milk gửi ẹ}????????
    \text{Giải đáp+ Lời giải và giải thích chi tiết:}
    a) 124+(-52)*124+124*47
    = 124(1-52+47)
    = 124*(-4)-496
    b) ( -55)*78 + 13*( -78) – 65* (-78)
    =-78*(55+13-65)
    =-78*3
    =-234
    c) ( 135-35)*(-47) + 53*(-48 – 52)
    =100*(-47)+53*(-100)
    =-100*(47+53)
    =-100*100
    =-10000
    d) 25*( 75- 49) + 75* ( 49-25)
    =25*75-25*49+75*49-75*25
    =[(25*75)-(25*75)]+(-25*49+75*49)
    =49*(-25+75)
    =49*50
    =2460

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