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

Toán Lớp 7: Thực hiện phép tính a) $\frac{5}{17}$ – $\frac{2}{9}$ – $\frac{20}{12}$ – $\frac{7}{9}$ + $\frac{12}{17}$ b) [6($\frac{-1}{3}$)$^{

Tháng Bảy 12, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: Thực hiện phép tính
a) $\frac{5}{17}$ – $\frac{2}{9}$ – $\frac{20}{12}$ – $\frac{7}{9}$ + $\frac{12}{17}$
b) [6($\frac{-1}{3}$)$^{2}$ – 3(-$\frac{1}{3}$) + 1] : ($\frac{-1}{3}$ – 1)
c)-7$\sqrt[]{36}$ + 5$^{2}$

Comments ( 1 )

  1. thienthanh
    thienthanh
    12 Tháng Bảy, 2022 at 3:38 chiều
    Reply
    a) \frac{5}{17} – \frac{2}{9} – \frac{20}{12} – \frac{7}{9} + \frac{12}{17}
    = (\frac{5}{17} + \frac{12}{17}) – (\frac{2}{9} + \frac{7}{9} ) – \frac{20}{12}  
    = 1 – 1 – \frac{20}{12}
    = 0 – \frac{20}{12}
    = -\frac{20}{12}
    b) [6(-\frac{1}{3})^2 – 3(-\frac{1}{3}) + 1] : (-\frac{1}{3} – 1)
    = [6 . \frac{1}{9} – (-1) + 1] : \frac{-4}{3}
    = [\frac{2}{3} – (-1) + 1] : \frac{-4}{3}
    = \frac{8}{3} . \frac{3}{-4}
    = \frac{8}{-4}
    = -2
    c) -7\sqrt{36} + 5^2
    = -7 . 6 + 25
    = -42 + 25
    = -17

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

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