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

Toán Lớp 6: tính hợp lý A= -2003+ ( – 21 + 75 + 2003 ) B= 1152 – ( 374 + 1152 ) + ( -56 + 374 ) C= 59 – ( 47 -11 ) – ( 11 – 47 – 11 ) 2. tìm x

Tháng Tư 17, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: tính hợp lý
A= -2003+ ( – 21 + 75 + 2003 )
B= 1152 – ( 374 + 1152 ) + ( -56 + 374 )
C= 59 – ( 47 -11 ) – ( 11 – 47 – 11 )
2. tìm x
1) 461 + ( x – 45 ) = 387
2) 11- ( -53 + x) = 97
3) 21- 2 . ( 13 – 4 . x ) = -45
4) 17 – 28 : ( 3 . x -18 ) = 25

Comments ( 2 )

  1. trucoanh55
    trucoanh55
    17 Tháng Tư, 2022 at 3:59 sáng
    Reply
    Câu 1 :
    A = -2003+ ( – 21 + 75 + 2003 )
    A = -2003 – 21 + 75 + 2003
    A = ( -2003 + 2003 ) + ( – 21 + 75 )
    A= 0 + 54
    A = 54
    B= 1152 – ( 374 + 1152 ) + ( -56 + 374 )
    B = 1152 – 374 – 1152 – 56 + 374
    B = ( 1152 – 1152 ) + ( -374 + 374 ) – 56
    B = 0 + 0 – 56
    B = -56
    C= 59 – ( 47 -11 ) – ( 11 – 47 – 11 )
    C = 59 – 47 + 11 – 11 + 47 + 11
    C = 59 + ( – 47 + 47 ) + ( 11 – 11 ) + 11
    C = 59 + 0 + 0 + 11
    C = 70
    Câu 2 : 
    a, 461 + ( x – 45 ) = 387
    x – 45 = 387 – 461
    x – 45 = -74
    x = -74 + 45
    x = -29
    Vậy x = -29
    b, 11- ( -53 + x) = 97
    -53 + x = 11 – 97
    -53+x =-86
    x = -86 – ( – 53 )
    x = -86 + 53
    x = -33
    Vậy x=-33
    c, 21- 2 . ( 13 – 4 . x ) = -45
    2.(13 – 4x ) = 21 – ( -45 )
    2.(13 – 4x ) =66
    13 – 4x = 66 : 2
    13 – 4x = 33
    4x = 13 – 33
    4x = -20
    x = -20 : 4
    x = -5
    Vậy x=-5
    d, 17 – 28 : ( 3 . x -18 ) = 25
    28 : ( 3 . x -18 ) = 17 – 25
    28 : ( 3 . x -18 ) = -8
    3 . x -18 = 28 : (-8)
    3 . x -18 = -7/2
    3x = 29/2
    x = 29/6
    Vậy x=29/6

  2. thienthanh
    thienthanh
    17 Tháng Tư, 2022 at 3:58 sáng
    Reply
    Bài 1:
    a)-2003+(-21+75+2003)
    =-2003-21+75+2003
    =-21+75
    =54
    b)1152-(374+1152)+(-56+374)
    =1152-374-1152-56+374
    =(1152-1152)+(-374+374)-56
    =-56
    c)59-(47-11)-(11-47-11)
    =59-47+11-(-47)
    =59-47+11+47
    =70
    Bài 2:
    a)461+(x-45)=387
    <=>x-45=-74
    =>x=-29
    b)11-(-53+x)=97
    <=>-53+x=-86
    =>x=-33
    3)21-2(13-4x)=-45
    <=>2(13-4x)=66
    <=>13-4x=33
    <=>4x=-20
    =>x=-5
    4)17-28:(3x-18)=25
    <=>28:(3x-18)=-8
    <=>3x-18=\frac{-7}{2}
    <=>3x=\frac{29}{2}
    =>x=\frac{29}{6}

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

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