tính nhanh

2*4*5*8*15

-----------------

80*150

Tính \(\frac{2^2}{3}.\frac{3^2}{8}.\frac{4^2}{15}...\frac{9^2}{80}\)

tính:

A=\(\frac{1^2}{1\cdot2}\cdot\frac{2^2}{2\cdot3}\cdot\frac{3^2}{3\cdot4}\cdot\frac{4^2}{4\cdot5}...\frac{8^2}{8\cdot9}\cdot\frac{9^2}{9\cdot10}\)

B=\(\frac{2^2}{3}\cdot\frac{^{3^2}}{8}\cdot\frac{4^2}{15}\cdot\frac{6^2}{35}\cdot\frac{7^2}{48}\cdot\frac{8^2}{63}\cdot\frac{9^2}{80}\)

TÍNH : E=\(\frac{2^2}{3}\times\frac{3^2}{8}\times\frac{4^2}{15}\times\frac{5^2}{24}\times\frac{6^2}{35}\times\frac{7^2}{48}\times\frac{8^2}{63}\times\frac{9^2}{80}\)

a,1\(\frac{11}{12}\) + 5/12*(4/5 - 1/10) :5/12

b, 3/4*8/9*15/16*24/15*35/36*48/49*63/64*80/81*99/100*120/121

7^80/(-1 3^4)-2^9/(8-8^3)--5^24*(-10^3+2 8^15)^2

Thực hiện phép tính:
a) -15 - ( -13 + 30)                                                   b) 225 - 150 : ( 30 + 3^2 . 5 )
c) 18.64 + 18.36 - 1200                                           d) 80- [ 130 - ( 12 - 4 )^2 ]

A= \(\sqrt{6+\sqrt{24}+\sqrt{8}+\sqrt{12}}-\sqrt{5+2\sqrt{6}}\)

B= \(\sqrt{12+\sqrt{60}+\sqrt{48}+\sqrt{80}}-\sqrt{8+2\sqrt{15}}\)

C= \(\sqrt{39+12\sqrt{10}+6\sqrt{2}+4\sqrt{5}}-\sqrt{38+12\sqrt{10}}\)