`@` `\text {Ans}`
`\downarrow`
`a)`
`2*2*4*4`
`= 2*2*2^2 * 2^2`
`= 2^(1+1+2+2) = 2^6`
`b)`
`10*1000*100000`
`= 10*10^3 *10^5`
`= 10^(1+3+5) = 10^9`
`c)`
`4^5 \div 2^7`
`= (2^2)^5 \div 2^7`
`= 2^10 \div 2^7 = 2^3`
`d)`
\(3^3\cdot18-3^3\cdot15\)
`= 3^3 * (18 - 15)`
`= 3^3 * 3 = 3^4`
`e)`
`6^3 \div 36`
`= 6^3 \div 6^2`
`= 6`
`f)`
`49^3 \div 7^4`
`= (7^2)^3 \div 7^4`
`= 7^6 \div 7^4 = 7^2`
`g)`
`a^9 \div a^7`
`= a^(9 - 7) = a^2`
`h)`
`(a*b)^6 \div b^6`
`= a^6 * b^6 \div b^6`
`= a^6`
Bài 2:
a) 48 . 410
= 48+10
= 418
b) 220.27
= 220+7
= 227
c) 512.55.54
= 512+5+4
= 521
d) 43.45.45
= 43+5+5
= 413
e) 86.85.85
= 86+5+5
= 816
g) x7.x4.x3
= x7+4+3
= x14
Bài 3:
a) 45 :4
= 45-1
= 44
b) 210:23
= 210-3
= 27
c) x9:x3
= x9-3
= x6
d) 5103:53
= 5103-3
= 5100
