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A = 2002 . 20012001 - 2001 . 20022002
= 2002 . 10001 . 2001 - 2001 . 10001 . 2002
= 0
B=[(315 + 372) . 3 + (372 + 315) . 7] : (26 . 13 + 74 . 14)
= [687 . (3 + 7)] : (338 + 1036)
= 6870 : 1374
= 5
a) A= ( 5016+912).37:13:74
A= 5928.37:13:74
A=219336:13:74
A=16872:7
A=228
b) B=[687.3+687.7]:(338+1036)
B=687.(3+7):1374
B=687.10:1374
B=6870:1374
B=5
\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)
Ta có 27^5=3^3^5=3^15
243^3=3^5^3=3^15
Vậy A=B
2^300=2^(3.100)=2^3^100=8^100
3^200=3^(2.100)=3^2^100=9^100
Vậy A<B
\(a,A=27^5\)và \(B=243^3\)
Ta xét :
\(A=27^5=\left(3^3\right)^5=3^{15}\)
\(B=243^3=\left(3^5\right)^3=3^{15}\)
Mà \(3^{15}=3^{15}\)
\(\Rightarrow A=B\)
\(b,A=2^{300}\)và \(B=3^{200}\)
Ta xét :
\(A=2^{300}=\left(2^3\right)^{100}=8^{100}\)
\(B=3^{200}=\left(3^2\right)^{100}=9^{100}\)
Mà \(9^{100}>8^{100}\)
\(\Rightarrow B>A\)