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-29.(85-47)-85.(47-29)
=-29.38-85.18
=-1102-1503
=-2605
-15.(23-29)+23-(15-29)
=-15.(-6)+23-(-14)
=90+23+14
=113+14
=127
-13.(55-29)+23.(15-29)
=-13.26+23.(-14)
=-338+(-322)
=-660
-10.(2+4)-5.(4-3)
=-10.6-5.1
=-60-5
=-65
\(A=\frac{-2}{17}+\frac{15}{23}+\frac{-15}{17}+\frac{4}{19}+\frac{8}{23}\)
\(=\left(\frac{-2}{17}+\frac{-15}{17}\right)+\left(\frac{15}{23}+\frac{8}{23}\right)+\frac{4}{19}\)
\(=\frac{-17}{17}+\frac{23}{23}+\frac{4}{9}\)
\(=-1+1+\frac{4}{9}=0+\frac{4}{9}=\frac{4}{9}\)
#Hoq chắc _ Baccanngon
Sửa đề: \(\dfrac{2}{17}+\dfrac{15}{23}+\dfrac{15}{17}+\dfrac{4}{19}+\dfrac{8}{23}\)
\(=\left(\dfrac{2}{17}+\dfrac{15}{17}\right)+\left(\dfrac{15}{23}+\dfrac{8}{23}\right)+\dfrac{4}{19}\)
\(=1+1+\dfrac{4}{19}\)
\(=2+\dfrac{4}{19}\)
\(=\dfrac{42}{19}\)
\(#Tmiamm\)
\(\dfrac{-11}{23}\).\(\dfrac{62}{15}\)+\(\dfrac{8}{5}\).\(\dfrac{-11}{23}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-11}{23}\).\(\left(\dfrac{62}{15}+\dfrac{8}{15}\right)\)-\(\dfrac{1}{23}\)
=\(\dfrac{-11}{23}\).\(\dfrac{14}{3}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-154}{69}\)-\(\dfrac{1}{23}\)
=\(\dfrac{-154}{69}\)-\(\)\(\dfrac{3}{69}\)
=\(\dfrac{-151}{69}\)
Chúc bn hc tốt!
Đề bài là \(\dfrac{8}{5}\) mà bạn có phải \(\dfrac{8}{15}\) đâu
\(=\dfrac{8}{23}+\dfrac{3}{19}-\dfrac{15}{17}-\dfrac{2}{17}+\dfrac{15}{23}=\dfrac{3}{19}\)
\(\left(\dfrac{8}{23}+\dfrac{3}{19}-\dfrac{15}{17}\right)-\left(\dfrac{2}{17}-\dfrac{15}{23}\right)\\ =\dfrac{8}{23}+\dfrac{3}{19}-\dfrac{15}{17}-\dfrac{2}{17}+\dfrac{15}{23}\\ =\left(\dfrac{8}{23}+\dfrac{15}{23}\right)-\left(\dfrac{15}{17}+\dfrac{2}{17}\right)+\dfrac{3}{19}\\ =1-1+\dfrac{3}{19}\\ =\dfrac{3}{19}\)
(-23)+15-8+23
=(-8)+15-8+23
=7-8+23
=(-1)+23
=22
(-23)+15-8+23
=[(-23)+23]+15-8
=0+7
=7