1+1=?
2+2=?
9.9+3=?
^_^
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6.6=9.9
2.3.2.3=3.3.3.3
2.(3.3)=3.(3.3)
2.9=3.9
vì có 2 số 9 nên bỏ cả 2
=> 2=3
a) \(\frac{3}{2}\). \(\frac{1}{3}\)+\(\frac{1}{2}\)
= 1/2 + 1/2
= 1
Mấy bài khác tương tự :)))
a) \(\frac{3}{2}.\frac{1}{3}+\frac{1}{2}=\frac{1}{2}+\frac{1}{2}=1\)
b) \(\left(\frac{1}{2}-\frac{1}{3}\right):\frac{1}{12}=\frac{1}{6}.12=2\)
c) \(\frac{5}{9}.\frac{7}{13}+\frac{5}{9}.\frac{9}{13}-\frac{5}{9}.\frac{3}{13}=\frac{5}{9}.\left(\frac{7}{13}+\frac{9}{13}-\frac{3}{13}\right)=\frac{5}{9}.1=\frac{5}{9}\)
\(\frac{4^5.9^3-12^5}{2^{10}.8^1-2^9.9^2}=\frac{\left(2^2\right)^5.\left(3^2\right)^3-\left(2^2.3\right)^5}{2^{10}.2^3-2^9.81}\)
\(=\frac{2^{10}.3^6-2^{10}.3^5}{2^{13}-2^9.81}=\frac{2^{10}.3^5\left(3-1\right)}{2^9\left(2^4-81\right)}=\frac{2.3^5.2}{-65}=\frac{-972}{65}\)
4/9.14/1/2-4/9.9/2
=4/9.29/2-4/9.9/2
=4/9.(29/2-9/2)
=4/9.20/2
=4/9.10
=40/9Nguyễn lan anh
ai k mh mh k lại
k cho mh nha
1/2.2 + 1/3.3 + 1/4.4 + ... + 1/9.9
> 1/2.3 + 1/3.4 + 1/4.5 + ... + 1/9.10
> 1/2 - 1/3 + 1/3 - 1/4 + 1/4 - 1/5 + ... + 1/9 - 1/10
> 1/2 - 1/10
> 5/10 - 1/10
> 2/5 (1)
1/2.2 + 1/3.3 + 1/4.4 + ... + 1/9.9
< 1/1.2 + 1/2.3 + 1/3.4 + ... + 1/8.9
< 1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 + ... + 1/8 - 1/9
< 1 - 1/9
< 8/9 (2)
Từ (1) và (2) => 2/5 < 1/2.2 + 1/3.3 + 1/4.4 + ... + 1/9.9 < 8/9
\(\frac{2^{19}\times27^3+15\times4^9\times9^4}{6^9\times2^{10}+12^{10}}\)
\(=\frac{2^{19}\times\left(3^3\right)^3+5\times3\times\left(2^2\right)^9\times\left(3^2\right)^4}{\left(2\times3\right)^9\times2^{10}+\left(3\times4\right)^{10}}\)
\(=\frac{2^{19}\times3^9+3\times5\times2^{18}\times3^8}{3^9\times2^9\times2^{10}+3^{10}\times4^{10}}\)
\(=\frac{2^{19}\times3^9+5\times2^{18}\times3^9}{3^9\times2^{19}+3^{10}\times\left(2^2\right)^{10}}\)
\(=\frac{2^{18}\times3^9\times\left(2+5\right)}{3^9\times2^{19}+3^{10}\times2^{20}}\)
\(=\frac{2^{18}\times3^9\times7}{2^{19}\times3^9\times\left(1+3\times2\right)}\)
\(=\frac{7}{2\times\left(1+6\right)}\)
\(=\frac{7}{2\times7}\)
\(=\frac{1}{2}\)
A = 2^19.27^3+15.4^9.9^4 / 6^9.2^10+12^10
= 2^19.3^9 + 5.2^18.3^9 / 3^9.2^19 + 2^20.3^10
= 2^18.3^9 ( 2 + 5 ) / 2^19.3^9.(1 + 2.3)
= (2 + 5) / 2(1 + 6)
= 7 / 2.7
= 1/2
ngu vãi ! dễ thế mà ko biết😛 😛 😛 😛 😛 😛 😛 😛 😛 😛 😛 \(\ge\le\)
1 + 1 = 2
2 + 2 = 4
9.9 + 3 = 84
^^