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

Toán Lớp 6: A 3 – ( 1/6 -x ) . 2/3 = 2/3 B 1/3 . /x-2/ – 3/7 = 4/7 C x/ 20 = 5/x D (3 1/2 – x ) . 1 1/4 = 15/16 3 1/2 1 1/4 là hôn s

Home/ Toán Lớp 6: A 3 – ( 1/6 -x ) . 2/3 = 2/3 B 1/3 . /x-2/ – 3/7 = 4/7 C x/ 20 = 5/x D (3 1/2 – x ) . 1 1/4 = 15/16 3 1/2 1 1/4 là hôn s

Toán Lớp 6: A 3 – ( 1/6 -x ) . 2/3 = 2/3 B 1/3 . /x-2/ – 3/7 = 4/7 C x/ 20 = 5/x D (3 1/2 – x ) . 1 1/4 = 15/16 3 1/2 1 1/4 là hôn s

Tháng Mười Hai 27, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: A 3 – ( 1/6 -x ) . 2/3 = 2/3
B 1/3 . /x-2/ – 3/7 = 4/7
C x/ 20 = 5/x
D (3 1/2 – x ) . 1 1/4 = 15/16
3 1/2 1 1/4 là hôn số nha

Comments ( 2 )

  1. lanngocha
    lanngocha
    27 Tháng Mười Hai, 2022 at 7:51 chiều
    Reply
    $a)3-($\frac{1}{6}$-x).\frac{2}{3}=\frac{2}{3}$
    $=>(\frac{1}{6}-x).\frac{2}{3}=3-\frac{2}{3}$
    $=>(\frac{1}{6}-x).\frac{2}{3}=\frac{7}{3}$
    $=>(\frac{1}{6}-x)=\frac{7}{3}÷\frac{2}{3}$
    $=>(\frac{1}{6}-x)=\frac{7}{2}$
    $=>x=\frac{1}{6}-\frac{7}{2}$
    $=>x=\frac{-10}{3}$
    $b)\frac{1}{3}./x-2/-\frac{3}{7}=\frac{4}{7}$
    $=>\frac{1}{3}./x-2/=\frac{4}{7}+\frac{3}{7}$
    $=>\frac{1}{3}./x-2/=1$
    $=>/x-2/=1÷\frac{1}{3}$
    $=>/x-2/=3$
    $x-2=3 hay x-2=-3$
    $x=3+2hayx=-3+2$
    $x=5 hay x=-1$
    $c)\frac{x}{20}=\frac{5}{x}$
    $=>x.x=5.20$
    $=>x^{2}=100$
    $=>x^{2}=10^{2}$
    $=>x=±10$
    $d)(3\frac{1}{2}-x).1\frac{1}{4}=\frac{15}{16}$
    $=>(\frac{7}{2}-x).\frac{5}{4}=\frac{15}{16}$
    $=>(\frac{7}{2}-x)=\frac{15}{16}÷\frac{5}{4}$
    $=>(\frac{7}{2}-x)=\frac{3}{4}$
    $=>x=\frac{7}{2}-\frac{3}{4}$
    $=>x=\frac{11}{4}$
    Chuc ban hoc tot
    Xin hay nhat cho nhom              

  2. myngocla
    myngocla
    27 Tháng Mười Hai, 2022 at 7:51 chiều
    Reply
    a)
    3-(1/6-x) . 2/3=2/3
    \to (1/6-x) . 2/3=3-2/3
    \to (1/6-x) . 2/3=7/3
    \to 1/6-x=7/3:2/3
    \to 1/6-x=7/2
    \to x=1/6-7/2
    \to x=-10/3
    Vậy x=-10/3
    b)
    1/3|x-2|-3/7=4/7
    \to 1/3|x-2|=4/7+3/7
    \to 1/3|x-2|=1
    \to |x-2|=3
    Trường hợp 1:
    x-2=3
    \to x=3+2
    \to x=5
    Trường hợp 2:
    x-2=-3
    \to x=-3+2
    \to x=-1
    Vậy x\in{-1;5}
    c)
    x/20=5/x
    \to x.x=20.5
    \to x^2=100
    \to x^2=10^2
    \to \(\left[ \begin{array}{l}x=10\\x=-10\end{array} \right.\) 
    Vậy x\in{-10;10}
    d)
    (3 1/2-x) . 1 1/4=15/16
    \to (7/2-x) . 5/4=15/16
    \to 7/2-x=15/16:5/4
    \to 7/2-x=3/4
    \to x=7/2-3/4
    \to x=11/4
    Vậy x=11/4

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

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