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

Toán Lớp 7: a,`2/3` – (`5/4`-`3/2`)+(`1/4`-`5/2`+`1/3`) b,`1/2`-(`5/3`-`3/4`+`7/6`)+`5/4`-`7/2`

Home/ Toán Lớp 7: a,`2/3` – (`5/4`-`3/2`)+(`1/4`-`5/2`+`1/3`) b,`1/2`-(`5/3`-`3/4`+`7/6`)+`5/4`-`7/2`

Toán Lớp 7: a,`2/3` – (`5/4`-`3/2`)+(`1/4`-`5/2`+`1/3`) b,`1/2`-(`5/3`-`3/4`+`7/6`)+`5/4`-`7/2`

Tháng Mười 29, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a,2/3 – (5/4-3/2)+(1/4-5/2+1/3)
b,1/2-(5/3-3/4+7/6)+5/4-7/2

Comments ( 2 )

  1. cattien
    cattien
    29 Tháng Mười, 2022 at 4:58 sáng
    Reply
    Giải đáp + Lời giải và giải thích chi tiết:
    a, $\dfrac{2}{3}$ – ( $\dfrac{5}{4}$ – $\dfrac{3}{2}$ ) + ( $\dfrac{1}{4}$ – $\dfrac{5}{2}$ + $\dfrac{1}{3}$ )
    = ( $\dfrac{2}{3}$ + $\dfrac{1}{3}$ ) – ( $\dfrac{5}{4}$ – $\dfrac{1}{4}$ ) – ( $\dfrac{5}{2}$ – $\dfrac{3}{2}$ )
    = 1 – 1 – 1
    = -1
    b, $\dfrac{1}{2}$ – ( $\dfrac{5}{3}$ – $\dfrac{3}{4}$ + $\dfrac{7}{6}$ ) + $\dfrac{5}{4}$ – $\dfrac{7}{2}$
    = $\dfrac{1}{2}$ – $\dfrac{5}{3}$ + $\dfrac{3}{4}$ – $\dfrac{7}{6}$ + $\dfrac{5}{4}$ – $\dfrac{7}{2}$
    =( $\dfrac{1}{2}$ – $\dfrac{7}{2}$ ) + ( $\dfrac{3}{4}$ + $\dfrac{5}{4}$ ) – ( $\dfrac{5}{3}$ + $\dfrac{7}{6}$ )
    = -3 + 2 – $\dfrac{17}{6}$
    = $\dfrac{-23}{6}$
     

  2. truongthanhhung
    truongthanhhung
    29 Tháng Mười, 2022 at 4:58 sáng
    Reply
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
      (2/3) – ( 5/4 -3/2) +(1/4 -5/2 +1/3)
    = 2/3 -5/4 +3/2 +1/4 -5/2+1/3
    = (2/3+1/3) +(-5/4+1/4) +(-5/2+3/2)
    = 1 -1 -1
    = -1
    b) 
    1/2 – ( 5/3 -3/4 +7/6 ) +5/4 -7/2
    = (1/2-7/2) -5/3 +3/4 +5/4 -7/6
    = -3 – (5/3 +7/6) +(3/4+5/4)
    = -3 -17/6 +2
    = -1 -17/6
    = -23/6

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

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