198-(-60-320)
198-(-60-320)=
cho mik cả lời giải
giúp mk mn ơi:
tính:
a) (-198-320)-(120-198)
b) (-721)+(-321)+42
c) A=1.2+2.3+3.4+...+99.100
d) B=1-2+3-4+...+99-100
gấp nha mn, mk thik cho
đợi mãi mà chẳng có ai giúp hết zợ
haizzz..."tỏ ra ý chán nản"
198-(-60-302)
198-(-60-302)
=198+60+302
=(198+302)+60
=500+60
=560
198 – (– 60 – 302)
900-{320:{31-[5.3]}+[60.(3^2-70)] SOS
$900-{320:[31-(5.3)]}+[60.(3^{2}-70)]$
$=900-[320:(31-15)]+[60.(9-70)]$
$=900-(320:16)+[60.(-61)]$
$=900-20-3660$
$=-2780$
\(900-\left(320:\left(31-\left(5.3\right)\right)\right)+\left(69.\left(3^2-70\right)\right)\)
\(=900-\left(320:\left(31-15\right)\right)+\left(69.\left(9-70\right)\right)\)
\(=900-\left(320:16\right)+\left(69.\left(-61\right)\right)\)
\(=900-20+\left(-4209\right)\)
\(=900-20-4209=-3329\)
35/198 + 5/18 - 7/36 + 9/60 - 11/90 + ... + 63/2976 - 65/3168
Rút gọn các phân số sau:
121×75×130×169/39×60×11×198
\(\dfrac{121\times75\times130\times169}{39\times60\times11\times198}\)
\(=\dfrac{25\times169}{6\times18}\)
\(=\dfrac{4225}{108}\)
Rút gọn các phân số sau:
121×75×130×169/39×60×11×198
BCNN ( 60 ; 32 ) =
ƯCLN ( 120 ; 320 ; 80 ) =
ai nhanh nhất mk k cho
BCNN ( 60 ; 32 ) = 320
ƯCLN ( 120 ; 320 ; 80 ) = 40
\(60=2^2.3.5\)
\(32=2^5\)
\(BCNN\left(60;32\right)=2^5.3.5=480\)
BCNN ( 60; 32 ) = 480
Ư CLN ( 120 ; 320 ; 80 ) = 40