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![](https://rs.olm.vn/images/avt/0.png?1311)
422=42.42=42.(40+2)=42.40+42.2
40.44=40.(42+2)=40.42+40.2
ta có 42>40 suy ra 2.42>40.2
suy ra 42.40+2.42>40.42+40.2
vậy422>40.44
![](https://rs.olm.vn/images/avt/0.png?1311)
`@` `\text {Ans}`
`\downarrow`
`a)`
\(24 \div a+24=30\)
`=> 24 \div a = 30 - 24`
`=> 24 \div a = 6`
`=> a = 24 \div 6`
`=> a = 4`
Vậy, `a=4`
`b)`
\( 1974 \div 14+a \times 141=423\)
`=> 141 + a \times 141 = 423`
`=> a \times 141 = 423 - 141`
`=> a \times 141 = 282`
`=> a = 282 \div 141`
`=> a = 2`
Vậy, `a=2`
`c)`
\(120-(45-a \times 4)=115\)
`=> 45 - a \times 4 = 120 - 115`
`=> 45 - a \times 4 = 5`
`=> a \times 4 = 45 - 5`
`=> a \times 4 = 40`
`=> a = 40 \div 4`
`=> a = 10`
Vậy, `a=10`
`d)`
\((a \times 4-44) \div 4=44\)
`=> a \times 4 - 44 = 44 \times 4`
`=> a \times 4 - 44 = 176`
`=> a \times 4 = 176 + 44`
`=> a \times 4 = 220`
`=> a = 220 \div 4`
`=> a = 55`
Vậy, `a = 55.`
a) 24:a+24=30
24:a= 30 - 24
24:a=6
a= 24:6
a=4
______
b) 1974:14+ax141=423
141 + a x 141 = 423
141 x (a+1) = 423
a+1 = 423 : 141
a+1=3
a=3-1
a=2
_____
c) 120-(45-ax4)=115
45 - a x 4= 120 - 115
45 - a x 4= 5
a x 4 = 45 - 5
a x 4 = 40
a = 40:4
a=10
______
d) (ax4-44):4=44
a x 4 - 44 = 44 x 4
a x 4 - 44 = 176
a x 4 = 176 + 44
a x 4 = 220
a= 220:4
a=55
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 2 6 = 64
b, 5 3 = 125
c, 4 4 = 256
d, 15 2 = 225
e, 100 2 = 10000
f, 20 3 = 8000
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 2 6 = 64. b) 5 3 = 125.
c) 4 4 = 256. d) 15 2 = 225.
e) 100 2 = 10000. f) 20 3 = 8000
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 2 6 = 64 . b ) 5 3 = 125 . c ) 4 4 = 256 . d ) 15 2 = 225 . e ) 100 2 = 10000 . f ) 20 3 = 8000 .
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,2^2=4,2^3=8,2^4=16,2^5=32,2^6=64,2^7=128,2^8=256,2^9=512,2^{10}=1024\)
\(b,3^2=9,3^3=27,3^4=81,3^5=243\)
\(c,4^2=16,4^3=64,4^4=256\)
\(d,5^2=25,5^3=125,5^4=625\)
E nha
Thank you
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