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`(1^1 +2^2 +3^3 +4^4 +...+2023^2023 )*(4^2 -144:3^2)`
`=(1^1 +2^2 +3^3 +4^4 +...+2023^2023 )*(16-144:9)`
`=(1^1 +2^2 +3^3 +4^4 +...+2023^2023 )*(16-16)`
`=(1^1 +2^2 +3^3 +4^4 +...+2023^2023 )*0`
`=0`
![](https://rs.olm.vn/images/avt/0.png?1311)
1.1=1
13=1
=>11=11
2.2=4
23=8
=>22=48
3.3=9
33=27
=>33=927
4.4=16
43=64
=>44=1664
5.5=25
53=125
=>55=25125
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 +88 + 99
= ( 11 + 99 ) + ( 88 + 22 ) + ( 33 + 77 ) + ( 44 + 66 ) + 55
= 100 + 100 + 100 + 100 + 55
= 100 x 4 + 55
= 400 + 55
= 455
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(42=2\cdot3\cdot7;70=2\cdot5\cdot7\)
=>\(BCNN\left(42;70\right)=2\cdot3\cdot5\cdot7=210\)
=>\(BC\left(42;70\right)=B\left(210\right)=\left\{0;210;420;...\right\}\)
b: \(70=2\cdot5\cdot7;180=3^2\cdot5\cdot2^2\)
=>\(BCNN\left(70;180\right)=2^2\cdot3^2\cdot5\cdot7=1260\)
=>\(BC\left(70;180\right)=\left\{1260;2520;...\right\}\)
c: \(5=5;7=7;8=2^3\)
=>\(BCNN\left(5;7;8\right)=5\cdot7\cdot8=280\)
=>\(BC\left(5;7;8\right)=\left\{280;560;...\right\}\)
d: \(12=2^2\cdot3;18=3^2\cdot2\)
=>\(BCNN\left(12;18\right)=2^2\cdot3^2=36\)
=>\(BC\left(12;18\right)=\left\{36;72;...\right\}\)
e: \(15=3\cdot5;18=3^2\cdot2\)
=>\(BCNN\left(15;18\right)=3^2\cdot2\cdot5=90\)
=>\(BC\left(15;18\right)=\left\{90;180;...\right\}\)
f: \(84=2^2\cdot3\cdot7;108=3^3\cdot2^2\)
=>\(BCNN\left(84;108\right)=2^2\cdot3^3\cdot7=756\)
=>\(BC\left(84;108\right)=\left\{756;1512;...\right\}\)
j: \(33=3\cdot11;44=2^2\cdot11;55=5\cdot11\)
=>\(BCNN\left(33;44;55\right)=3\cdot2^2\cdot5\cdot11=660\)
=>\(BC\left(33;44;55\right)=\left\{660;1320;...\right\}\)
g: \(1=1;12=2^2\cdot3;27=3^3\)
=>\(BCNN\left(1;12;27\right)=1\cdot2^2\cdot3^3=108\)
=>\(BC\left(1;12;27\right)=\left\{108;216;...\right\}\)
n: \(5=5;9=3^2;11=11\)
=>\(BCNN\left(5;9;11\right)=5\cdot3^2\cdot11=495\)
=>\(BC\left(5;9;11\right)=\left\{495;990;...\right\}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)19 x (28 - 3) / 5x (3+35 )
= 19 x 25 /5 x 38
= 475/190
= 5/2
còn mấy ý kia chung j đặt đấy nhé mik hơi lười
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 3:
a: 12-15=-3
b: -4+22=18
c: =16-9x(34-25)=16-9x9=16-81=-65
Câu 2:
a: \(x\in\left\{-20;-19;...;19;20\right\}\)
tổng là 0
b: \(x\in\left\{1;2;3;...;29\right\}\)
Số số hạng là 29-1+1=29(số)
Tổng là 15x29=435
12+x-44-55=11-42-22
12+x-(-11)= -53
12+x= -53+(-11)
12+x= -64
x= -64-12
x= -76
Tick ủng hộ mình nha
ai chơi bang bang tick tôi tôi cho nick