\(=\dfrac{5^{102}\cdot\left(5-1\right)}{5^{99}\cdot5^2\cdot2-5^{101}}=\dfrac{5^{102}\cdot4}{5^{101}\cdot1}=5\cdot4=20\)
\(=\dfrac{5^{102}\cdot\left(5-1\right)}{5^{99}\cdot5^2\cdot2-5^{101}}=\dfrac{5^{102}\cdot4}{5^{101}\cdot1}=5\cdot4=20\)
a.1+(-3)+5+(-7)+....+17+(-19)
b.1-4+7-10+....-100+103
c.1+2-3-4+5+6-7-8+...-99-100+101+102
a.1+(-3)+5+(-7)+....+17+(-19)
b.1-4+7-10+....-100+103
c.1+2-3-4+5+6-7-8+...-99-100+101+102
a.1+(-3)+5+(-7)+....+17+(-19)
b.1-4+7-10+....-100+103
c.1+2-3-4+5+6-7-8+...-99-100+101+102
a.1+(-3)+5+(-7)+....+17+(-19)
b.1-4+7-10+....-100+103
c.1+2-3-4+5+6-7-8+...-99-100+101+102
Bài 3: Tính tổng sau:
A = 101+ 103 + 105 + ...... +201
B = (-1) + 2 - 3 + 4 - 5+ 6 - ...... - 99 + 100
E=1012+1022+1032+...+1992+2002
Tim y :
a, ( 2y + 1 ) 3 = 125
b, ( y - 5 ) 4 = ( y - 5 ) 6
Cac ban lop 7 giup mk nhe ! Ca cac anh chi tren lop 7 nua ! Ai nhanh mk tick cho nha !!!
chung minh neu a la so nguyen thi
a, M=a(a+2)-a(a-5)-7 chia het cho 7
b, N=(a-2)(a+3)-(a-3)(a+2) la so chan
Cac bn giai ra giup mk nhe!!!!! Cam on nhiu !!!!
b1 :tính
a) 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - 109
b) ( a-1 ) - ( a-3 )
c) (2+b) - ( b+1)