3/5 + ( -4/7 + 2/5 + 7/8 ) +- 3/7
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2) -3(4 - 7) + 5(-3 + 2)
= -3.4 + 3.7 - 5.3 + 5.2
= -12 + 21 -15 + 10
= 31 - 27
= 4
4) -5(2 - 7) + 4(2 - 5)
= -5.2 + 5.7 + 4.2 - 4.5
= -10 + 35 + 8 - 20
= 38 - 30
= 8
![](https://rs.olm.vn/images/avt/0.png?1311)
3: \(=20-12-8+12=20-8=12\)
5: \(=-18-42-21-35=-116\)
3: \(=-15+18-12+8=-27+26=-1\)
2: \(=-12+21-15+10=9-5=4\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7)=-5.(-1)-7.2
=5-14
=-9
8)=7.(-2) - 9.(-5)
= -14-(-45)
=31
9)= -8.(-1)+7.4
=8+28
=36
10)= -2.(-2)+4.2
=4+8
=12
![](https://rs.olm.vn/images/avt/0.png?1311)
5: \(=3-\dfrac{1}{4}+\dfrac{2}{3}-5+\dfrac{1}{3}+\dfrac{6}{5}-6+\dfrac{7}{4}-\dfrac{3}{2}\)
\(=3-5-6+\dfrac{-1}{4}+\dfrac{7}{4}+\dfrac{2}{3}+\dfrac{1}{3}+\dfrac{6}{5}-\dfrac{3}{2}\)
\(=-8+\dfrac{3}{2}+1+\dfrac{-3}{10}\)
\(=-7+\dfrac{15-3}{10}=-7+\dfrac{6}{5}=-\dfrac{29}{5}\)
6: \(=6-\dfrac{2}{3}+\dfrac{1}{2}-5-\dfrac{5}{3}+\dfrac{3}{2}-3+\dfrac{7}{3}-\dfrac{5}{2}\)
\(=6-5-3-\dfrac{2}{3}-\dfrac{5}{3}+\dfrac{7}{3}+\dfrac{1}{2}+\dfrac{3}{2}-\dfrac{5}{2}\)
\(=-2-\dfrac{1}{2}=-\dfrac{5}{2}\)
7: \(=\dfrac{5}{3}-\dfrac{3}{7}+9-2-\dfrac{5}{7}+\dfrac{2}{3}+\dfrac{8}{7}-\dfrac{4}{3}-10\)
\(=9-2-10+\dfrac{5}{3}+\dfrac{2}{3}-\dfrac{4}{3}+\dfrac{-3}{7}-\dfrac{5}{7}+\dfrac{8}{7}\)
=-3+1
=-2
8: \(=8-\dfrac{9}{4}+\dfrac{2}{7}+6+\dfrac{3}{7}-\dfrac{5}{4}-3-\dfrac{2}{4}+\dfrac{9}{7}\)
\(=8+6-3+\dfrac{2}{7}+\dfrac{3}{7}+\dfrac{9}{7}-1-\dfrac{2}{4}\)
\(=11+2-1-\dfrac{1}{2}\)
=11+1/2
=11,5
\(\frac{3}{5}\)+ ( \(\frac{-4}{7}\)+ \(\frac{2}{5}\)+ \(\frac{7}{8}\)) + \(\frac{-3}{7}\)
= \(\frac{3}{5}\)+ \(\frac{-4}{7}\)+ \(\frac{2}{5}\)+ \(\frac{7}{8}\)+ \(\frac{-3}{7}\)
= ( \(\frac{3}{5}\)+ \(\frac{2}{5}\)) + (\(\frac{-4}{7}\)+\(\frac{-3}{7}\)) +\(\frac{7}{8}\)
= 1+ (-1) + \(\frac{7}{8}\)
= 0 + \(\frac{7}{8}\)
= \(\frac{7}{8}\)
Nhớ k cho mk nha!!!
bạn viet đọc xong một quyển sách trong 3 ngày biet rang thu nhat ban viet doc duoc 1/3 so trang ngay thu 2 ban doc duoc 3/5 so sach con lai rieng nay thu ba doc duoc 72 trang tinh so trang quyen sach viet da doc