Gán A=2 ; B=0 Nhập công thức : B=1/A(A+2) : A=A+2 : C=C+B
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thực hiện phếp tính
\(\frac{\frac{2}{3}+\frac{2}{7}-\frac{1}{4}}{-1-\frac{3}{7}+\frac{3}{28}}\)
\(\frac{1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10}{3\cdot4+6\cdot3+9\cdot12+12\cdot16+15\cdot20}\)
Rút gọn \(A=\frac{2\cdot4+4\cdot8+8\cdot12+12\cdot16+16\cdot20}{1\cdot2+2\cdot4+4\cdot6+6\cdot8+8\cdot10}\) ta được A=
Rút gọn \(A=\frac{2\cdot4+4.8+8\cdot12+12\cdot16+16\cdot20}{1\cdot2+2\cdot4+4\cdot6+6\cdot8+8\cdot10}\) ta được A =?
\(20\%x+\frac{2}{5}x=x-4\)
\(\frac{\frac{2}{3}+\frac{2}{7}\cdot\frac{1}{14}}{-1-\frac{3}{7}+\frac{3}{28}}\)
\(\frac{1\cdot2+2\cdot4+3\cdot6+4\cdot8+5\cdot10}{3\cdot4+6\cdot8+9\cdot12+12\cdot16+15\cdot20}\)
giải hội mik mới cách làm lun nha
\(\frac{1}{6\cdot10}+\frac{1}{7\cdot9}+\frac{1}{8\cdot8}+\frac{1}{9\cdot7}+\frac{1}{10\cdot6}\)
B=\(\frac{1}{2\cdot4}+\frac{1}{4\cdot6}+\frac{1}{6\cdot8}+...+\frac{1}{96\cdot98}+\frac{1}{98\cdot100}\)
Please help me!!!!!!!!
\(a=\frac{2\cdot9\cdot8+3\cdot12\cdot10+4\cdot15\cdot12+...+98\cdot297\cdot200}{23\cdot4+3\cdot4\cdot5+4\cdot5\cdot6+...+98\cdot99\cdot100}\)
Tính a2
1, Tính
a, \(\frac{5}{2\cdot4}\)+\(\frac{5}{4\cdot6}\)+\(\frac{5}{6\cdot8}\)+.......+\(\frac{5}{48\cdot50}\)
HELP ME!!!!!!!!
Rút gọn:
a,\(A=\frac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^9\cdot6^{19}-7\cdot2^{29}\cdot27^6}\)
b,\(B=\left(1+\frac{1}{1\cdot3}\right)\left(1+\frac{1}{2\cdot4}\right)\left(1+\frac{1}{3\cdot5}\right)...\left(1+\frac{1}{2014\cdot2016}\right)\)