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

Toán Lớp 7: a ) 19 . 43 + ( -20 ) . 43 – ( -40 ) b) 465 +[( -38 ) + ( -465 ] – [ 12 – ( -42 ) ] c) 6 mũ 7 : 6 mũ 5 + 3 ² . 2021 mũ 0 tìm x a) 72

Home/ Toán Lớp 7: a ) 19 . 43 + ( -20 ) . 43 – ( -40 ) b) 465 +[( -38 ) + ( -465 ] – [ 12 – ( -42 ) ] c) 6 mũ 7 : 6 mũ 5 + 3 ² . 2021 mũ 0 tìm x a) 72

Toán Lớp 7: a ) 19 . 43 + ( -20 ) . 43 – ( -40 ) b) 465 +[( -38 ) + ( -465 ] – [ 12 – ( -42 ) ] c) 6 mũ 7 : 6 mũ 5 + 3 ² . 2021 mũ 0 tìm x a) 72

Tháng Mười Hai 3, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a ) 19 . 43 + ( -20 ) . 43 – ( -40 )
b) 465 +[( -38 ) + ( -465 ] – [ 12 – ( -42 ) ]
c) 6 mũ 7 : 6 mũ 5 + 3 ² . 2021 mũ 0
tìm x
a) 721 – x = 615
b) ( 17x – 25 ) : 2 ³ + 65 = 9 ²
c) -50 – ( 4 – x ) = 20

Comments ( 2 )

  1. ngocbichchau
    ngocbichchau
    3 Tháng Mười Hai, 2022 at 10:46 chiều
    Reply
    $\text{19 . 43 + ( – 20 ) . 43 – ( – 40 ) }$
    $\text{= 43 . ( – 20 ) + ( – 40 ) – 19 }$
    $\text{= 43 . ( – 80 ) – 19 }$
    $\text{b, 721 – x = 615}$
    $\text{x = 721 – 615}$
    $\text{x = 106}$
          

  2. daolanhoa
    daolanhoa
    3 Tháng Mười Hai, 2022 at 10:45 chiều
    Reply
    a)
    19.43+(-20).43-(-40)
    =43.[19+(-20)]-(-40)
    =43.[19-20]+40
    =43.(-1)+40
    =-43+40
    =-3
    b)
    465+[(-38)+(-465)]-[12-(-42)]
    =465+[(-38)-465]-[12+42]
    =465+(-503)-54
    =465-503-54
    =-92
    c)
    6^7 :6^5 +3^2 ×2021^0
    =6^2 +3^2 ×1
    =36+9×1
    =45
    Tìm x
    a)
    721-x=615
    x=721-615
    x=106
    Vậy x=106
    b)
    (17x-25):2^3 +65=9^2
    (17x-25):8+65=81
    (17x-25):8=81-65
    (17x-25):8=16
    17x-25=16.8
    17x-25=128
    17x=128+25
    17x=153
    x=153:17
    x=9
    Vậy x=9
    c)
    -50-(4-x)=20
    4-x=(-50)-20
    4-x=-70
    x=4-(-70)
    x=74
    Vậy x=74
    $@Masonn$
     

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

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