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a) 54 : 52 + 32 . 33
= 52 + 35 = 25 + 243 = 268
Học tốt!!!
a) 54:52+32.33=52 + 35=25+243 = 278
b) 3+6+9+12+...+96
=3.1+3.2+3.3+3.4+...+3.32
=3.(1+2+3+4+...+32)
=3.\(\frac{\left(32+1\right).32}{2}\)=\(3.33.16=1584\)
a,\(\frac{-3}{5}-\left(\frac{-2}{5}+2\right)=\frac{-3}{5}-\frac{8}{5}=1\)
b,\(\frac{-21}{10}+\frac{21}{10}.\frac{5}{7}=-\frac{21}{10}+\frac{105}{70}=-\frac{21}{10}+\frac{15}{10}=-\frac{6}{10}\)
a) 5 x (-8) x 2 x (-3)
= (5 x 2) x (-8 x (-3))
= 10 x 24
= 240
b) 3 x (-5)2 + 2 x (-5) - 20
= 3 x 25 + 2 x (-5) - 20
= 3 x 5 x (-5) + 2 x (-5) - (-5) x (-4)
= 15 x (-5) + 2 x (-5) - (-5) x (-4)
= (15 + 2 - (-4)) x (-5)
= 21 x (-5)
= -105
A=33. \(\left(1-\frac{2}{3}\right)\left(1-\frac{2}{5}\right)...\left(1-\frac{2}{99}\right)\)
A=33.\(\frac{1}{3}.\frac{3}{5}....\frac{97}{99}\)
A=33.\(\frac{1}{99}\)
A=\(\frac{33}{99}=\frac{1}{3}\)
a) 22 + 3 . 23 = 22 + 3 . 8 = 22 + 24 = 46
b) 41 . 67 + 33 . 41 = 41 . ( 67 + 33 ) = 41 . 100 = 4100
c) 322 . 5 - [ 622 : 4 + 2 . ( 11 - 8) ] = 322 . 5 - [ 622 : 4 + 2 . 3 ] = 322 . 5 - [ 155,5 + 6 ] = 322 . 5 - 161,5 = 1610 + 161,5 = 1448,5
\(\frac{3}{5}:\frac{7}{3}+\frac{3}{5}:\frac{7}{4}-1\frac{3}{5}\)
\(=\frac{3}{5}.\frac{3}{7}+\frac{3}{5}.\frac{4}{7}-1\frac{3}{5}\)
\(=\frac{3}{5}.\left(\frac{3}{7}+\frac{4}{7}\right)-1\frac{3}{5}\)
\(=\frac{3}{5}.1-1+\frac{3}{5}\)
\(=\frac{3}{5}-\frac{3}{5}-1\)
\(=-1\)
a) 35 :73 +35 :74 −135
\(=\frac{49}{20}-\frac{8}{5}\)
= \(\frac{17}{20}\)
a, 6/7+5/9+8/7-2/9=(6/7+8/7)+(5/9-2/9)=14/7+3/9=2+1/3=7/3
b, 5+7/3=22/3
a)\(\frac{2}{3}+\frac{3}{4}+\frac{5}{6}\)
\(=\frac{8+9+10}{12}\)
\(=\frac{27}{12}=\frac{9}{4}\)
b)\(\frac{15}{8}-\frac{7}{12}+\frac{5}{6}\)
\(=\frac{45-14+20}{24}\)
\(=\frac{51}{24}=\frac{17}{8}\)
2)
a)\(\frac{2}{5}+\frac{7}{13}+\frac{3}{5}+\frac{1}{7}\)
\(=\frac{2}{5}+\frac{3}{5}+\frac{7}{13}+\frac{1}{7}\)
\(=1+\frac{7}{13}+\frac{1}{7}\)
\(=\frac{20}{13}+\frac{1}{7}\)
\(=\frac{153}{91}\)
Tí tớ trả lời tiếp
a3.a.a5 = a3+1+5 = a9.
Vậy nha bn! Chúc bn học tốt
a3 . a . a5 = a3+1+5 = a9
Chúc bạn học tốt nha