Tinh 4/5+3/7; 5/6-1/3. ;4/9×3. ;1/2÷3/2
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a,{ [ - 2/3 + 3/7 ] + [ -1/3 + 4/7 ] } ; 4/5 =
( -3/3 + 7/7 ) : 4/5 =
(-1+1 ) :4/5 =
0 :4/5 = 0
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\(\dfrac{2}{5}+\dfrac{3}{7}+\dfrac{3}{5}+\dfrac{4}{7}\\ =\left(\dfrac{2}{5}+\dfrac{3}{5}\right)+\left(\dfrac{3}{7}+\dfrac{4}{7}\right)\\ =\dfrac{5}{5}+\dfrac{7}{7}\\ =1+1\\ =2.\)
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\(A=\left(7-\frac{3}{4}+\frac{1}{3}\right)-\left(-6+\frac{5}{4}-\frac{4}{3}\right)-\left(13-\frac{7}{4}+\frac{5}{3}\right)\)
\(A=7-\frac{3}{4}+\frac{1}{3}+6-\frac{5}{4}+\frac{4}{3}-13+\frac{7}{4}-\frac{5}{3}\)
\(A=\left(7+6-13\right)+\left(-\frac{3}{4}-\frac{5}{4}+\frac{7}{4}\right)+\left(\frac{1}{3}+\frac{4}{3}-\frac{5}{3}\right)\)
\(A=0-\frac{1}{4}+0=-\frac{1}{4}\)
Nếu có sai sót mong bn thông cảm nha
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\(\dfrac{2}{5}+\dfrac{4}{5}:4=\dfrac{2}{5}+\dfrac{1}{5}=\dfrac{3}{5}\)
\(\dfrac{3}{8}\times\dfrac{7}{4}-\dfrac{3}{8}=\dfrac{3}{8}\left(\dfrac{7}{4}-1\right)=\dfrac{3}{8}\times\dfrac{3}{4}=\dfrac{9}{32}\)
\(\dfrac{6}{5}-3:\dfrac{15}{4}=\dfrac{6}{5}-\dfrac{4}{5}=\dfrac{2}{5}\)
\(=\dfrac{2}{5}+\dfrac{4}{5}\times\dfrac{1}{4}\\ =\dfrac{2}{5}+\dfrac{1}{5}\\ =\dfrac{3}{5}\\ \\ =\dfrac{3}{8}\times\dfrac{7}{4}-\dfrac{3}{8}\times1\\ =\dfrac{3}{8}\times\left(\dfrac{7}{4}-1\right)\\ =\dfrac{3}{8}\times\dfrac{3}{4}\\ =\dfrac{9}{32}\\\\ =\dfrac{6}{5}-3\times\dfrac{4}{15}\\ =\dfrac{6}{5}-\dfrac{4}{5}\\ =\dfrac{2}{5}\)
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Bài làm
- \(\frac{4}{5}+\frac{3}{7}\)
= \(\frac{28}{35}+\frac{15}{35}=\frac{43}{35}\)
\(\frac{4}{5}+\frac{3}{7}=\frac{43}{35}\)
\(\frac{5}{6}-\frac{1}{3}=\frac{1}{2}\)
\(\frac{4}{9}.3=\frac{4}{3}\)
\(\frac{1}{2}:\frac{3}{2}=\frac{1}{3}\)