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

Toán Lớp 7: 2/3+4/5 -2/13+-11/26 1/2-5/7 Tìm X X+1/2=3/4 X+2/3=3/5 Tính -1/15+-1/5

Tháng Chín 22, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: 2/3+4/5
-2/13+-11/26
1/2-5/7
Tìm X
X+1/2=3/4
X+2/3=3/5
Tính
-1/15+-1/5

Comments ( 2 )

  1. lanthuhoa
    lanthuhoa
    22 Tháng Chín, 2022 at 7:20 chiều
    Reply
    Giải đáp:
    a) $\dfrac{2}{3}$ + $\dfrac{4}{5}$ = $\dfrac{10}{15}$ + $\dfrac{12}{15}$ = $\dfrac{22}{15}$
    b) $\dfrac{-2}{13}$ + $\dfrac{-11}{26}$ = $\dfrac{-4}{26}$ – $\dfrac{11}{26}$ = $\dfrac{-15}{26}$
    c) $\dfrac{1}{2}$ – $\dfrac{5}{7}$ = $\dfrac{7}{14}$ – $\dfrac{10}{14}$ = $\dfrac{-3}{14}$
    Tìm $x$
    a) $x$ + $\dfrac{1}{2}$ = $\dfrac{3}{4}$ 
    $x$ = $\dfrac{3}{4}$ – $\dfrac{1}{2}$ 
    $x$ = $\dfrac{3 – 2}{4}$ 
    $x$ = $\dfrac{1}{4}$
    b) $x$ + $\dfrac{2}{3}$ = $\dfrac{3}{5}$ 
    $x$ = $\dfrac{3}{5}$ – $\dfrac{2}{3}$ 
    $x$ =$\dfrac{9 – 10}{15}$ 
    $x$ = $\dfrac{-1}{15}$
    Tính
    $\dfrac{-1}{15}$ + $\dfrac{-1}{5}$ = $\dfrac{-1}{15}$ – $\dfrac{3}{15}$ = $\dfrac{-4}{15}$
    #Ling
     
     

  2. thanoanghha
    thanoanghha
    22 Tháng Chín, 2022 at 7:20 chiều
    Reply
    2/3+4/5=10/15+12/15=22/15
    -2/13+-11/26=-4/26+-11/26=-15/26
     1/2-5/7=7/14-10/14=-3/14
    tìm x
    a)X+1/2=3/4
    x=3/4-1/2
    x=1/4
    b)x+2/3=3/5
    x=3/5-2/3
    x=-1/15
    tính 
    -1/15+-1/5=-1/15+-3/15=-4/15

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

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