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a) $3^8:3^6=3^{8-6}=3^2$
$19^7:19^3=19^{7-3}=19^4$
$2^{10}:8^3=2^{10}:(2^3)^3=2^{10}:2^9=2^{10-9}=2^1$
$12^7:6^7=(12:6)^7=2^7$
$27^5:81^3=(3^3)^5:(3^4)^3=3^{15}:3^{12}=3^{15-12}=3^3$
b) $10^6:10=10^{6-1}=10^5$
$5^8:25^2=5^8:(5^2)^2=5^8:5^4=5^{8-4}=5^4$
$4^9:64^2=4^9:(4^3)^2=4^9:4^6=4^{9-6}=4^3$
$2^25:32^4=2^{25}:(2^5)^4=2^{25}:2^{20}=2^{25-20}=2^5$
$18^3:9^3=(18:9)^3=2^3$
\(\cdot3^8:3^6=3^{8-6}=3^2\)
\(\cdot19^7:19^3=19^{7-3}=19^4\)
\(\cdot2^{10}:8^3=2^{10}:\left(2^3\right)^3=2^{10}:2^9=2\)
\(\cdot12^7:6^7=\left(12:6\right)^7=2^7\)
\(\cdot27^5:81^3=\left(3^3\right)^5:\left(3^4\right)^3=3^{15}:3^{12}=3^3\)
\(\cdot10^6:10=10^{6-1}=10^5\)
\(\cdot5^8:25^2=5^8:\left(5^2\right)^2=5^8:5^4=5^4\)
\(\cdot4^9:64^2=4^9:\left(4^3\right)^2=4^9:4^6=4^3\)
\(2^{25}:32^4=2^{25}:\left(2^5\right)^4=2^{25}:2^{20}=2^5\)
\(18^3:9^3=\left(18:9\right)^3=2^3\)
\(a,11^8:11^3=11^{8-3}=11^5\)
\(b,17^{11}:17^9=17^{11-9}=17^2\)
\(c,4^3:2^2=4^{3-1}=4^2\)
\(d,a^5:a=a^{5-1}=a^4\)
2. a) 118 : 113 = 115 c) 43 : 42 = 41
b) 1711 : 179 = 172 d) a5 : a = a4
3. a) 36 : 34 = C1 : 3 . 3 . 3 . 3 . 3 . 3 : 3 . 3 . 3 . 3
= 9
C2 : 36 : 34
= 36-4
= 32
b) 57 : 55 = C1 : 5 . 5 . 5 . 5 . 5 . 5 . 5 : 5 . 5 . 5 . 5 . 5
= 25
C2 : 57 : 55
= 57-5
= 52
4. 356 = 3 . 100 + 5 . 10 + 6 = 3 . 102 + 5 . 10 + 6 . 100
3243 = 3 . 1000 + 2 . 100 + 4 . 10 + 3 = 3 . 103 + 2 . 102 + 4 . 10 + 3 . 100
abbc = a . 1000 + b . 100 + b . 10 + c = 4 . 103 + b . 102 + b . 10 + c . 100
xong rồi đó. mệt lắm
sau 58 ,7,50 ,2,-60 là phép tính khác .
mấy b giúp mk nha ?
a. 33 : 35 = 3-2 ; 1113 : 1110 = 113 ; 1919 : 1917 = 192
b. 106 : 104 = 102 ; 175 : 175 = 170 ; 2327 : 2323 = 234