1) a3 . a9 = a3+9 = a12
2) ( a5 )7 = a5.7 = a35
3) ( a6 )4 . a12 = a6.4 . a12 = a24 . a12 = a24+12 = a36
4) 56 : 53 + 33 . 32 = 56-3 + 33+2 = 53 + 35 = 125 + 32 = 157
5) tương tự
1)a12
2)a35
3)a36
4)53+31=125+3=128
5)4.25-2.9=100-18=82
1, \(a^3.a^9=a^{3+9}=a^{12}\)
2, \(\left(a^5\right)^7=a^{5.7}=a^{35}\)
3, \(\left(a^6\right)^4.a^{12}=a^{6.4}.a^{12}=a^{24}.a^{12}=a^{24+12}=a^{36}\)
4, \(5^6:5^3+3^3.3^2=5^{6-3}+3^{3+2}=5^3+3^5=125+243=368\)
5, \(4.5^2-2.3^2=4.25-2.9=100-18=82\)
Chúc em học giỏi
Tính giá trị các biểu thức sau :
1, a3 . a 9
2, ( a5 ) 7
3, ( a6 ) 4 . a 12
4, 56 : 53 + 33 . 32
5, 4 . 52 - 2 . 32
1, a3.a9=a3+9=a12
2, (a5)7=a5.7=a35
3, (a6)4.a12=a6.4.a12=a24.a12=a24+12=a36
4, 56:53+33.32=56−3+33+2=53+35=125+243=368
5, 4.52−2.32=4.25−2.9=100−18=82