Tinh M =20162-20152+20142-20132+...+22-21
Trinh bay cach lam nua nhe
thanks
Tính C = 1 2 – 2 2 + 3 2 – 4 2 + 5 2 – 6 2 + … . + 2013 2 – 2014 2 + 2015 2
C=12-22+32-42+52-62+..+20132-20142+20152
SSH:(20152-12):10+1=2015
(12-22)+(32-42)+(52-62)+...+(20132-20142)+20152
-10+(-10)+(-10)+...+(-10)+20152
-10x(2015-1):2+20152=12
=> C=12
Tinh M =20162-20152+20142-20132+...+22-21
Trinh bay cach lam nua nhe
thanks
Tinh M =20162-20152+20142-20132+...+22-21
Trinh bay cach lam nua nhe
thanks
3456 x 5678 - 1234
2222 + 3456 -5677
trih bay cach lam nua
3456*5678-1234 = 19623168-1234=19621934
Tim x biet:
(2x-1)5=(2x-1)7
Trinh bay cach lam nua nhe
Tim x biet:
(2x-1)5=(2x-1)7
Trinh bay cach lam nua nhe
chin/ muoi mot + tam/ muoi lam + muoi ba/ muoi mot + bay/ muoi lam
tinh cach thuan tien nhat
9/11 + 8/15 + 13/11 + 7/15 =(9/11 + 13/11) + (8/15 + 7/15) = 22/11 + 15/15 = 2+1 =3
(9/11+13/11)+(8/15+7/15)=22/11+15/15=2+1=3
= [ 9/11 + 13/11] + [ 8/ 15 + 7/15 ]
= 22/11 + 1
= 22/11 + 1/1 = 22/11 + 11/11
= 33/11
Tinh:
\(B=\frac{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}}{\frac{1}{7}+\frac{1}{23}-\frac{1}{1009}+\frac{1}{7}.\frac{1}{23}.\frac{1}{1009}}\)
Trinh bay cach lam nua nhe
Co gi ko hieu thi vao phan doc them