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

Toán Lớp 7: a, -$\frac{2}{3}$ : x + $\frac{5}{8}$ = $\frac{-7}{12}$ b, $\frac{1}{2}$ . ( 3x – $\frac{1}{5}$ ) = $\frac{1}{5}$ . ( 3 – $\frac{1}{2

Home/ Toán Lớp 7: a, -$\frac{2}{3}$ : x + $\frac{5}{8}$ = $\frac{-7}{12}$ b, $\frac{1}{2}$ . ( 3x – $\frac{1}{5}$ ) = $\frac{1}{5}$ . ( 3 – $\frac{1}{2

Toán Lớp 7: a, -$\frac{2}{3}$ : x + $\frac{5}{8}$ = $\frac{-7}{12}$ b, $\frac{1}{2}$ . ( 3x – $\frac{1}{5}$ ) = $\frac{1}{5}$ . ( 3 – $\frac{1}{2

Tháng Tám 21, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a, -$\frac{2}{3}$ : x + $\frac{5}{8}$ = $\frac{-7}{12}$
b, $\frac{1}{2}$ . ( 3x – $\frac{1}{5}$ ) = $\frac{1}{5}$ . ( 3 – $\frac{1}{2}$ )
c, 4x -3 = x-6

Comments ( 2 )

  1. mocmien87
    mocmien87
    21 Tháng Tám, 2022 at 5:10 chiều
    Reply
    a, (-2/3) : x + 5/8 = -7/12
    <=> (-2/3) : x = -7/12 – 5/8
    <=> (-2/3) : x = -29/24
    <=> x = (-2/3) : (-29/24)
    <=> x = 16/29
    Vậy x = 16/29
    b, 1/2 . (3x – 1/5) = 1/5 . (3 -1/2)
    <=> 1/2 . (3x – 1/5) = 1/5 . 5/2
    <=> 1/2 . (3x – 1/5) = 1/2
    <=> 3x – 1/5 = 1/2 : 1/2
    <=> 3x – 1/5 = 1
    <=>3x = 1 + 1/5
    <=> 3x = 6/5
    <=> x= 6/5 : 3
    <=> x = 2/5
    Vậy x = 2/5
    c, 4x – 3 = x-6
    <=> 4x – 3 – x = -6
    <=> 3x – 3 = -6
    <=> 3x = -6 + 3
    <=> 3x = -3
    <=> x = (-3) : 3
    <=> x =-1
    Vậy x = -1

  2. thanhmaianh
    thanhmaianh
    21 Tháng Tám, 2022 at 5:10 chiều
    Reply
    Lời giải chi tiết:
    -2/3:x+5/8=(-7)/12
    =>-2/3:x=(-7)/12-5/8
    =>-2/3:x=(-29)24
    =>x=(-2)/3:((-29)/24)
    =>x=16/29
    Vậy x=16/29
    b) 1/2xx(3x-1/5)=1/5xx(3-1/2)
    =>1/2xx(3x-1/5)=1/5xx5/2
    =>1/2xx(3x-1/5)=1/2
    =>3x-1/5=1/2:1/2
    =>3x-1/5=1
    =>3x=1+1/5
    =>3x=6/5
    =>x=6/5:3
    =>x=2/5
    Vậy x=2/5
    c) 4x-3=x-6
    =>4x-x-6=3
    =>3x-6=3
    =>3x=3+6
    =>3x=9
    =>x=9:3
    =>x=3

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

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