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1 ) 118 : 113 = 118-3 = 115
1711 : 179 = 1711-9 = 172
43 : 42 = 43-2 = 41
a5 : a = a5-1 = a4
2 ) a) 36 : 34 = 729 : 81
C2 : 36 : 34 = 36-4 = 32 = 9
b) 57 : 55 = 15125 : 625
= 25
C2 : 57 : 55 = 57-5 = 52 = 25
= 9
\(\left(5^7+5^9\right)\left(6^8+6^{10}\right)\left(2^4-4^2\right)=\left(5^7+5^9\right)\left(6^8+6^{10}\right)\left(16-16\right)=0\)
\(\left(7^3+7^5\right)\left(5^4+5^6\right)\left(3^3.3-9^2\right)=\left(7^3+7^5\right)\left(5^4+5^6\right)\left[3^4-\left(3^2\right)^2\right]\)
\(=\left(7^3+7^5\right)\left(5^4+5^6\right)\left(3^4-3^4\right)=0\)
a)56 : 52 + 2.22 - 122 b)75:72+46:43+ 225
c)38: 35 + 43 +124 d)85: 83 + 74:72+69
e)97: 95+ 3.32 - 1200. F)49: 47: 4.42 - 192
Bài làm :
a) \(5^6:5^2+2.2^2-12^2\)
\(=5^4+2^3-12^2\)
\(=625+8-144\)
\(=633-144\)
\(=489\)
b) \(7^5:7^2+4^6:4^3+225\)
\(=7^3+4^3+225\)
\(=343+64+225\)
\(=407+225\)
\(=632\)
c) \(3^8:3^5+4^3+124\)
\(=3^3+64+124\)
\(=27+64+124\)
\(=91+124\)
\(=215\)
d) \(8^5:8^3+7^4:7^2+69\)
\(=8^2+7^2+69\)
\(=64+49+69\)
\(=113+69\)
\(=182\)
e) \(9^7:9^5+3.3^2-120^0\)
\(=9^2+3^3-1\)
\(=81+27-1\)
\(=108-1\)
\(=107\)
f) \(4^9:4^7:4.4^2-192\)
\(=4^2:4^3-192\)
\(=4^{-1}-192\)
\(=-191,75\)
\(\left(5^7+5^9\right).\left(6^8+6^{10}\right).\left(2^4-4^2\right)\)
= \(\left(5^7+5^9\right).\left(6^8+6^{10}\right).\left(16-16\right)\)
= \(\left(5^7+5^9\right).\left(6^8+6^{10}\right).0\)
= 0
Vì \(2^4\)=\(4^2\)=>=0