A = ( 10099 + 21 ) x ( 10099 - 9897 ) : 2
A = 10120 x 202 : 2
A = 10120 x 101
A = 1022120
A = ( 10099 + 21 ) x ( 10099 - 9897 ) : 2
A = 10120 x 202 : 2
A = 10120 x 101
A = 1022120
Cho A=\(\frac{3}{2}+\frac{13}{12}+\frac{21}{20}+...+\frac{9901}{9900}\)và B=\(\frac{5}{6}+\frac{19}{20}+\frac{41}{42}+...+\frac{10099}{10100}\)Tính A-B
Tính A-B biết
A=3/2+13/12+31/30+...+9901/9900
B=5/6+19/20+41/42+...+10099/10100
B=5/6+19/20+41/42+......+10099/10100 và C= 3/2+13/12+31/30+..........+9901/9900
Tính C - B
So sánh:
a ) A = 17 18 + 1 17 19 + 1 v à B = 17 17 + 1 17 18 + 1 ; b ) C = 100 100 + 1 100 90 + 1 v à D = 100 99 + 1 100 89 + 1 ;
(1+2+3+4+.........+10099+10000+10001) - 225 = ?
Cho A =\(\frac{3}{2}\)+\(\frac{13}{12}\)+\(\frac{31}{30}\)+...+\(\frac{9901}{9900}\),B=\(\frac{5}{6}\)+\(\frac{19}{20}\)+\(\frac{41}{42}\)+...+\(\frac{10099}{10100}\).Tính A-B
Cho B=5/6+19/20+41/42+...+10099/10100 và C=3/2+13/12+31/30+...+9901/ Tính C-B
Tính tổng \(A=\frac{1}{5}-\frac{1}{^{5^2}}+\frac{1}{^{5^3}}-...+\frac{1}{^{5^{99}}}\) \(B=\frac{1}{2}+\frac{5}{6}+...+\frac{10099}{10100}\)
Tính giá trị biểu thức:
A=-5x/21 + -5y/21 + -5z/21 biết x+y=-z
Tính A=\(\frac{-5x}{21}+\frac{-5y}{21}+\frac{-5z}{21}bietx+y=-z\)