15-3+2-6+4-9+1= ?
tick nhe
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đầu tiên được `1/15 tiếp theo kết quả được`1/4` và
được `5`
a)\(3-\left(\frac{1}{4}+\frac{2}{3}\right)-\left(5+\frac{1}{3}-\frac{6}{5}\right)-\left(6-\frac{7}{4}+\frac{3}{2}\right)\)
=\(3-\frac{1}{4}-\frac{2}{3}-5-\frac{1}{3}+\frac{6}{5}-6+\frac{7}{4}-\frac{3}{2}\)
=\(\left(3-5-6\right)+\left(\frac{-1}{4}+\frac{7}{4}\right)+\left(\frac{-2}{3}-\frac{1}{3}\right)+\left(\frac{6}{5}-\frac{3}{2}\right)\)
=\(-8+\frac{3}{2}-1-\frac{3}{10}\)
=\(\left(-8-1\right)+\left(\frac{3}{2}-\frac{3}{10}\right)\)
=-9+\(\frac{6}{5}\)
=\(\frac{-39}{5}\)
1/2+3/5+1/9+1/127+7/18+4/35+2/7
=(1/2+1/9)+(3/5+2/7)+1/127+7/18+4/35
=11/18+31/35+1/127+7/18+4/35
=(11/18+7/18)+(31/35+4/35)+1/127
=1+1+1/127
=2+1/127
=2\(\frac{1}{127}\)
=
1.
7/15:(1/2-9/10xX)-1/6=13/6
=>7/15:(1/2-9/10xX)=13/6+1/6
=>7/16:(1/2-9/10xX)=7/3
=>1/2-9/10xX=7/16:7/3
=>1/2-9/10xX=3/16
=>9/10xX=1/2-3/16
=>9/10xX=5/16
=>X=5/16:9/10
=>X=25/72
1/2 + 1/3 + 1/4 = 6/12 + 4/12 + 3/12 = 13/12
2/3 + 3/4 + 4/5 = 8/12 + 9/12 + 4/5 = 17/12 + 4/5 = 85 / 60 + 48 / 60 = 133/ 60
6/5 + 4/3 + 7/9 = 18/ 15 + 20/15 + 7/9 = 38 /15 + 7/ 9 = 114/45 +35/45 = 149/45
8/9 - 5/6 = 16/18 - 15/18 = 1/18
15/17 - 11 /13 = 195/221 -187/221= 8/221
a) \(\frac{1}{2}+\frac{1}{3}+\frac{1}{4}\)
= \(\frac{6}{12}+\frac{4}{12}+\frac{3}{12}\)
= \(\frac{13}{12}\).
b) \(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}\)
= \(\frac{8}{12}+\frac{9}{12}+\frac{4}{5}\)
= \(\frac{17}{12}+\frac{4}{5}\)
= \(\frac{85}{60}+\frac{48}{60}\)
= \(\frac{133}{60}\).
c)\(\frac{6}{5}+\frac{4}{3}+\frac{7}{9}\)
= \(\frac{54}{45}+\frac{62}{45}+\frac{35}{45}\)
= \(\frac{151}{45}\).
d) \(\frac{8}{9}-\frac{5}{6}\)
= \(\frac{16}{18}-\frac{15}{18}\)
= \(\frac{1}{18}\).
e) \(\frac{15}{17}-\frac{11}{13}\)
= \(\frac{195}{221}\)\(-\frac{187}{221}\)
= \(\frac{8}{221}\).
A= 3( 1+3+3^2+3^3+3^4+3^5+3^6+3^7+3^8) chia hết cho 3
=4
bằng 4 nha![vui vui](https://hoc24.vn/media/cke24/plugins/smiley/images/vui.png)