Tính thuận tiện
2/3×1/3+1/3×2/3-1/3
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2/3 : 1/2 + 1/3 : 1/2
= (2/3 + 1/3) : 1/2
= 1 : 1/2
= 1 x 2/1
= 2
1/2 + 1/3 + 1/4 + 1/5 + 4/5 + 3/4 + 2/3 + 1/2
= (1/2 + 1/2) + (1/3 + 2/3) + (1/4 + 3/4) + (1/5 + 4/5)
= 1 + 1 + 1 + 1
= 4
3/5 x (17/2 + 1/2 + 1)
= 3/5 x (\(\dfrac{17+1+2}{2}\))
= 3/5 x 20/2
= 3/5 x 10
= \(\dfrac{3X10}{5}=\dfrac{30}{5}=6\)
= 3/2 + 2/3 + 2/4 + 2/5
= (6/4 + 2/4) + (2/3 + 2/5)
= 8/4 + 16/ 15
= 46/15
\(\frac{1}{2}-\frac{2}{5}+\frac{1}{3}-\frac{3}{5}+\frac{1}{6}\)
\(=\frac{3}{6}-\frac{2}{5}+\frac{2}{6}-\frac{3}{5}+\frac{1}{6}\)
\(=\left(\frac{3}{6}+\frac{2}{6}+\frac{1}{6}\right)+\left(\frac{2}{5}+\frac{3}{5}\right)\)
\(=1+1\)
\(=2\)
@muối
1/2 - 2/5 + 1/3 - 3/5 + 1/6
= 1/2 + 1/3 + 1/6 - 2/5 - 3/5
= (1/2 + 1/3 + 1/6) - (2/5 + 3/5)
= 1 - 1
= 0
Chúc bạn học tốt.
😁😁😁
\(\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}\)
\(=1-\frac{1}{4}=\frac{3}{4}\)
\(\dfrac{2}{3}\times\dfrac{1}{3}+\dfrac{1}{3}\times\dfrac{2}{3}-\dfrac{1}{3}\)
\(=\dfrac{1}{3}\times\left(\dfrac{2}{3}+\dfrac{2}{3}-1\right)\)
\(=\dfrac{1}{3}\times\dfrac{1}{3}=\dfrac{1}{9}\)