2 + 4 + 6 + 8 + .....+ 100
= ( 2 + 98 ) + (3 + 97 )+ ( 4 + 96 ) + ....( 50 + 50 ) + 100
= 100 + 100 + 100 + 100 +.....+ 100 + 100
=5100
a.1-2+3-4+......+99-100
b.2-4+6-8+......-48+50
c.1+2-3-4+.......+97+98-99-100
2+4+6+8+...+98+100=.....
giải thích cách làm cho mk nhé
Tính: A = 2^3 + 4^3 + 6^3 +...+98^3 +100^3
tính
A=1+[-2]+[-3]+4+5+[-6]+[-7]+8+.............+99-100-101
A=-2;-4;-6;-8;-10;.......-98;-100
Các bạn giúp mik nha!!!!!!!
TÍNH
A=1-2-3-4+5-6-7-8+9-10-11-12+...+97-98-99-100
chứng minh rằng:
\(\dfrac{1}{2^2}+\dfrac{1}{4^2}+\dfrac{1}{6^2}+\dfrac{1}{8^2}+...+\dfrac{1}{100^2}< \dfrac{1}{2}\)
\(Tính\) \(hợp\) \(lí\)
\(S=101+\left(-102\right)+103+\left(-104\right)+...+\left(-2018\right)\)
\(P=1-2-3+4+5-6-7+8+9-...-98-99+100\)
A = ( - 36) : 2 - 8 . 32 + | - 100 | : | + 20 |
B = 3 + ( - 5) + 7 + ( - 9) + 11 + ( - 13) + 15 + ( - 17)
C = 2 - 3 + 4 - 5 + 6 - 7 + ... + 2012 - 2013
