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

Toán Lớp 6: a, (x+8)-11=20-15 b, 2x-(3+x)=5-7 c,(3x-2 mũ 4).7 mũ 5=2.7 mũ 6

Toán Lớp 6: a, (x+8)-11=20-15
b, 2x-(3+x)=5-7
c,(3x-2 mũ 4).7 mũ 5=2.7 mũ 6

Comments ( 2 )

  1. $\text{a/ (x + 8) – 11 = 20 – 15}$ $\\$ $\text{(x + 8) – 11 = 5}$ $\\$ $\text{x + 8 = 5 + 11}$ $\\$ $\text{x + 8 = 16}$ $\\$ $\text{x = 16 – 8}$ $\\$ $\text{x = 8}$ $\\$ $\text{b/ 2x – (3 + x) = 5 – 7}$ $\\$ $\text{= 2x – (x + 3) = -2}$ $\\$ $\text{2x – x – 3 = -2}$ $\\$ $\text{x – 3 = -2}$ $\\$ $\text{x = -2 + 3}$ $\\$ $\text{x = 1}$ $\\$ $\text{c/ (3x – $2^{4}$). $7^{5}$ = 2. $7^{6}$}$ $\\$ $\text{3x – 16. = 2. $7^{6}$ : $7^{5}$}$ $\\$ $\text{3x – 16. = 2. 7} $ $\\$ $\text{3x – 16 = 14}$ $\\$ $\text{3x = 14 + 16}$ $\\$ $\text{3x = 30}$ $\\$ $\text{x = 30 : 3}$ $\\$ $\text{x = 10.}$
     

  2. Giải đáp+Lời giải và giải thích chi tiết:
    a, (x+8)-11=20-15
    (x+8)-11=5
    x+8=5+11
    x+8=16
    x=16-8
    x=8
    b, 2x-(3+x)=5-7
    2x-3-x=-2
    x-3=-2
    x=-2+3
    x=1
    c, (3x-2^4).7^5 = 2. 7^6
    3x-2^4 = 2.7^6 : 7^5
    3x-16=2.7
    3x-16=14
    3x=14+16
    3x=30
    x=30:3
    x=10

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

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