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(19+1)+(18+2)+(17+3)+(16+4)+(15+5)+(14+6)+(13+7)+(12+8)+(11+9)+20)+10
=20+20+20+20+20+20+20+20+20+20=(20*10)+10
=210
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
=(1+19)+(2+18)+(3+17)+(4+16)+(5+15)+(6+14)+(7+13)+(8+12)+(9+11)+(10+20)
=20+20+20+20+20+20+20+20+20+30
=(20 x 9) + 30
=180 + 30
=210
tk nha
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14/15 + 3/11 + 1/15 + 3/11 + 10/12
= ( 3/11 + 3/11) + (14/15 + 1/15) + 5/6
= 6/11 + 1 + 5/6
= 6/11 + 5/6 +1
= 91/66 +1
=
Đ/S:
mình trình bày hơi xấu, xin lỗi nha
bạn tự tính 91/66 + 1 nha
![](https://rs.olm.vn/images/avt/0.png?1311)
5/14\(\times\)7/13\(\times\)26/25
=\(\frac{5\times7\times26}{14\times13\times25}\)(rút gọn)
=1/5
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{12}{13}+\frac{2}{7}+\frac{8}{13}+\frac{5}{7}\)
\(=\frac{12}{13}+\frac{8}{13}+\frac{5}{7}+\frac{2}{7}\)
\(=\frac{20}{13}+1\)
\(=\frac{33}{13}\)
\(\frac{12}{13}+\frac{2}{7}+\frac{8}{13}+\frac{5}{7}\)
\(=\left(\frac{12}{13}+\frac{8}{13}\right)+\left(\frac{2}{7}+\frac{5}{7}\right)\)
\(=\frac{20}{13}+1\)
\(=\frac{33}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
14/15 + 6/11 + 1/15 + 5/11 + 22/11
=(14/15 +1/15)+(6/11 + 5/11 + 22/11)
=1+3
=4
![](https://rs.olm.vn/images/avt/0.png?1311)
14/15+3/11+1/15+3/11=10/22
=[14/15+1/15]+[3/11+3/11]
=[14/15+1/15]+[3/11*2]
= 1+6/11
=17/11
![](https://rs.olm.vn/images/avt/0.png?1311)
b,14/13:1/2+3/13*2-2*7/13=14/13*2+3/13*2-2*7/13
=2*(14/13+3/13-7/13)
=2*10/13
=20/13
11+12-13-14+15
=11+(12+15)-(13+14)
=11+(17-17)
=11+0
=11
11+12-13-14+15
=11+(12+15)-(13+14)
=11+0
=11