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

Toán Lớp 6: Tìm x biết a) 5(x + 35) = 515 b) 6.x – 5 = 19 c) 12x – 33 = 32.33 d) 4. (x – 12 ) + 9 = 17 e)4x²+2.12=88 f)123-(x-5)=120 c)2 mũ x+1 +2m

Tháng Bảy 4, 2022 Toán học 1 Comment 0 views

Toán Lớp 6: Tìm x biết
a) 5(x + 35) = 515
b) 6.x – 5 = 19
c) 12x – 33 = 32.33
d) 4. (x – 12 ) + 9 = 17
e)4x²+2.12=88
f)123-(x-5)=120
c)2 mũ x+1 +2mũ x=48

Comments ( 1 )

  1. thanhthuythu
    thanhthuythu
    4 Tháng Bảy, 2022 at 11:35 chiều
    Reply
    a, 5.(x+35)=515
    => x+35=515:5
    => x+35=103
    => x=103-35
    => x=68
    —–
    b, 6x-5=19
    => 6x=19+5
    => 6x=24
    => x=24:6
    => x=4
    —–
    c, 12x-33=32.33
    => 12x-33=1056
    => 12x=1056+33
    => 12x=1089
    => x=1089:12
    => x=90,75
    —–
    d, 4.(x-12)+9=17
    => 4.(x-12)=17-9
    => 4.(x-12)=8
    => x-12=8:4
    => x-12=2
    => x=2+12
    => x=14
    —–
    e, 4x^2+2.12=88
    => 4x^2+24=88
    => 4x^2=88-24
    => 4x^2=64
    => x^2=64:4
    => x^2=16
    => x=+-4
    —–
    f, 123-(x-5)=120
    => x-5=123-120
    => x-5=3
    => x=3+5
    => x=8
    —–
    c, 2^(x+1)+2^x=48
    => 2^x. 2^1+2^x=48
    => 2^x. (2^1+1)=48
    => 2^x. 3=48
    => 2^x=48:3
    => 2^x=16
    => 2^x=2^4
    => x=4

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

Nguyệt Minh

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