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

Toán Lớp 7: Thực hiện phép tính: a) $\frac{15}{34}$+$\frac{7}{21}$+$\frac{19}{34}$-$\frac{20}{15}$+$\frac{3}{7}$ b) 26$\frac{1}{5}$.$\frac{3}{4}$ –

Toán Lớp 7: Thực hiện phép tính:
a) $\frac{15}{34}$+$\frac{7}{21}$+$\frac{19}{34}$-$\frac{20}{15}$+$\frac{3}{7}$
b) 26$\frac{1}{5}$.$\frac{3}{4}$ – $\frac{3}{4}$.44$\frac{1}{5}$
c) (-$\frac{1}{3}$)$^{2}$ -($\frac{1}{4}$:2-$\frac{7}{16}$. $\frac{-4}{21}$)

Comments ( 1 )

  1. Lời giải chi tiết:
    a) 15/34+7/21+19/34-20/15+3/7
    =(15/34+19/34)+(7/21-20/15)+3/7
    =1+(-1)+3/7
    =0+3/7
    =3/7
    b) 261/5xx3/4-3/4xx441/5
    =3/4xx(26\frac{1}{5}-44\frac{1}{5})
    =3/4xx(-18)
    =-27/2
    c) (-1/3)^2-(1/4:2-7/16.(-4)/21)
    =1/9-(1/8+1/12)
    =1/9-5/24
    =-7/72

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