A = 2 + 20 + 23 + 25 + ..... + 299
Giải dùm nha mấy bạn
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j) -[16-(-20)+(-30)-(-11-37)]
=-(16+20-30+11+37)=-16-20+30-11-37=-22
A) 1243 : {23 . 2 [14 + 23 . (34 - 23) + 12]} - 21 . 2
B) 23 . 25 + 23 . 76 - 23
= 23 . 25 + 23 . 76 - 23 . 1
= 23 . ( 76 + 25 - 1 )
= 23 . 100
= 2300
C) 45 : 5 + 34 . 3
= 9 + 34/3
= 61/3
B ) 23 . 25 + 23 . 76 - 23
23 . ( 25 + 76 )
23 . 101
2323
C ) 45 : 5 + 34 . 3
9 + 102
111
Mình chỉ làm 2 câu thôi phiền cậu lm nốt câu A nhé
k cho mik nha
ta co:25^35 va 125^15
(5^2)^35 va (5^3)^15
5^70 va 5^45
vi 5^70 >5^45
Suy ra 25^35>125^15
minh chi lam giup ban cau dau thoi nhe!
a; \(\dfrac{21}{11}\) x \(\dfrac{22}{17}\) x \(\dfrac{68}{63}\)
= \(\dfrac{21\times11\times2\times17\times4}{11\times17\times21\times3}\)
= \(\dfrac{11\times17\times21}{11\times17\times21}\) x \(\dfrac{2\times4}{3}\)
= 1 x \(\dfrac{8}{3}\)
= \(\dfrac{8}{3}\)
b; \(\dfrac{5}{14}\) \(\times\) \(\dfrac{7}{13}\) x \(\dfrac{26}{25}\)
= \(\dfrac{5\times7\times2\times13}{7\times2\times13\times5\times5}\)
= \(\dfrac{5\times7\times2\times13}{5\times7\times2\times13}\) x \(\dfrac{1}{5}\)
= 1 x \(\dfrac{1}{5}\)
= \(\dfrac{1}{5}\)
a)y+25=(-63)-(-7)
y+25=(-63)+7
y+25=-56
y=(-56)-25
y=-81
b.y+20=95-75
y+20=20
y=20-20
y=0
c.11-(15+11)=x-(25-9)
11-26=x-16
-15=x-16
x=-15+16
x=1
d)x-25=(7-x)-(25+7)
2x-25=7-(25+7)
2x-25=7-32
2x-25=-25
2x=(-25)+25
2x=0
x=0:2
x=0
tick cho mk nha bạn
trả lời : It will scare children's eyes when playing in a dark room
\(A=2+2^0+2^3+2^5+...+2^{99}\)
\(\Rightarrow4A=2^3+2^2+2^5+2^7+...+2^{101}\)
\(\Rightarrow4A-A=\left(2^3+2^2+...+2^{101}\right)-\left(2+2^0+...+2^{99}\right)\)
\(\Rightarrow3A=2^3+2^2+2^{101}-\left(2^0+2\right)\)
\(\Rightarrow3A=12+2^{101}-3\)
\(\Rightarrow A=\frac{2^{101}+9}{3}\)