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4 . 52+ 81 : 32 - ( 13 - 4 )2
= 4 . 25 + 81 : 9 - 9\(^2\)
= 100 + 9 - 81
= 28
\(\left(5^{15}:5^{13}+4:2^2\right)-81:3^2.2\)
\(\left(5^{15-13}+2^2:2^2\right)-3^4:3^2.2\)
\(\left(5^2+1\right)-3^2.2\)
\(\left(25+1\right)-9.2\)
\(26-18=8\)
a) \(\frac{16.64.8^2}{4^3.2^5.16}=\frac{16.4^3.\left(2^3\right)^2}{4^3.2^5.16}=\frac{16.4^3.2^6}{4^3.2^5.16}=2\)
\(\frac{64^2.81^3.34}{2^{13}.3^9.17}=\frac{\left(2^6\right)^2.\left(3^4\right)^3.2.17}{2^{13}.3^9.17}=\frac{2^{13}.3^{12}.17}{2^{13}.3^9.17}=3^3=27\)
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\(3^3.18-3^3.12=3^3.2.3^2-3^3.2^2.3=3^5.2-3^4.2^2=3^4.2.\left(3-2\right)=3^4.2=162\\ \)
a) A = 2 + 23+25+...+249
=> 22.A = 23+25+27+...+251
22.A - A = 251-2
3A=251-2
\(A=\frac{2^{51}-2}{3}\)
b) B = 31-35+39-313+...-381
=> 34.B = 35 - 39+ 313 - 317+...-385
=> 34.B - B = -385-31
81B - B = -385-31
\(B=\frac{-3^{85}-3^1}{80}\)
c) C = -4-42-43-44-...-4100
=> 4C = -42-43-44-45-...-4101
=> 4C - C = -4101+4
3C = -4101+4
\(C=\frac{-4^{101}+4}{3}\)
mk chx học haha đáng lẽ k nên bình luận ! Xin thông cảm
a) 100:{250:[450−(4.53−25.4)]}100:{250:[450−(4.53−25.4)]}
=100:{250:[450−(4.125−25.4)]}=100:{250:[450−(4.125−25.4)]}
=100:{250:[450−(500−100)]}=100:{250:[450−(500−100)]}
=100:[250:(450−400)]=100:[250:(450−400)]
=100:(250:50)=100:(250:50)
=100:5=100:5
=20=20
b) 4(18−15)−(5−3).324(18−15)−(5−3).32
=4.3−2.32=4.3−2.32
=4.3−2.9=4.3−2.9
=12−18=12−18
=−6=−6