tinh hop ly:1+6+11+..+46+51
Tính gia tri cua biểu thức bang tính hop ly S=1+0+11+10+......+46+51
Số các số hạng của dãy là : (51-1):1+1=51(số hạng)
S=(51+1)x51:2=1326
chắc chắn đúng lun
k cho mình nha
Tinh hop ly
6 3/8 + 5 1/2
3/11 . 31/6 3/11. 19/6
tinh gia tri bieu thuc sau bang cach hop ly
1-6+11-16+21+...+91-96+101
1-6+11-16+21-...+91-96+101 =(1-6)+(11-16)+(21-26)+....+(91-96)+101 =(-5)+(-5)+.....+(-5)+101 (có 10 số (-5) ) =(-5).10+101 =-50+101 =51
42\46+250\186+(-2121\2323)+(-125125\143143)
tinh hop ly
\(\frac{42}{46}+\frac{250}{186}+\left(-\frac{2121}{2323}\right)+\left(-\frac{125125}{143143}\right)\)
\(=\frac{21}{23}+\frac{125}{93}+\left(-\frac{21}{23}\right)+\left(-\frac{125}{143}\right)\)
\(=\left(\frac{21}{23}-\frac{21}{23}\right)+\frac{125}{93}+\left(-\frac{125}{143}\right)\)
\(=0+\frac{125}{93}+\left(-\frac{125}{143}\right)\)
\(=\frac{6250}{13299}\)
Tinh hop ly:
(1+2^4+2^8) : (1+2+2^2+...+2^11)
Tinh bang cach hop ly
\(\frac{-3}{31}+\frac{-6}{17}+\frac{1}{25}+\) \(\frac{-28}{31}+\frac{-11}{17}+\frac{-1}{5}\)
thuc hien cac phep tinh sau 1 cach hop ly (3.4.2^16)^2/11.2^13.4^11-16^0
hay tinh phep tinh sau hop ly:
(13-135+49)-(13+49)
26.(24-11)-24.(26-11)
(13-135+49)-(13+49)
= 13-135 + 49 - 13-49
= ( 13-13) + ( 49-49) -135
= 0 -135
=-135
26.(24-11)-24.(26-11)
= 26.24 - 11.26 - 24.26 - 11.24
= 24.(26-26) -11(26-24)
= 0 - 11.2
=-22
\(\left(13-135+49\right)-\left(13+49\right)\))
\(=13-135+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-135\)
\(=0-135=-135\)
\(26.\left(24-11\right)-24.\left(26-11\right)\)
\(=26.24-11.26-24.26-11.24\)
\(=24.\left(26-26\right)-11.\left(26-24\right)\)
\(=0-11.2=-22\)
tinh nhanh
a, 4.7.76+8.24
b,136.48+16.272+68.20.2
c,3.25.8+4.36.6+2.38.12
d,10+11+12+13+....+99
e,1+6+11+16+....+46+51