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a) 0,1253.83
=(0,125.8)3
=13
=1.
b)(-39)4:134
=394:134
=(39:13)4
=34
=81
a)0,1253 . 83 = (0,125 . 8)3 = 13 = 1
b) (-39)4 : 134 = ((-39 ): 13 )4 = 34 = 81
\(\left(0,25\right)^8=\left[\left(0,5\right)^2\right]^8=\left(0,5\right)^{2.8}=\left(0,5\right)^{16}\)
\(\left(0,125\right)^4=\left[\left(0,5\right)^3\right]^4=\left(0,5\right)^{3.4}=\left(0,5\right)^{12}\)
\(\left(0,0635\right)^2=\left[\left(0,5\right)^3\right]^2=\left(0,5\right)^{3.2}=\left(0,5\right)^6\)
Bài 1:
\(\left(-0,125\right)\times7,9\times80\)
\(=\left(-0,9875\right)\times80\)
\(=79.\)
\(\left(0,125\right)\times1\times0,25\times8\times\left(-4\right)\)
\(=0,125\times0,25\times8\times\left(-4\right)\)
\(=0,03125\times8\times\left(-4\right)\)
\(=0,25\times\left(-4\right)\)
\(=\left(-1\right).\)
Bài 2:
\(x+\frac{8}{3}^2=\frac{1}{9}\)
\(x+16=\frac{1}{9}\)
\(x=\frac{1}{9}-16.MSC=9\)
\(x=\frac{1}{9}-\frac{144}{9}\)
\(x=\frac{-143}{9}.\)
Sorry bạn,cho mk 1 câu cmt,mk cũng thích đọc truyện one piece lắm đó,mk thích nhất là luffly
\(\dfrac{1}{12345}-3\dfrac{3}{4}+0,125+3\dfrac{3}{4}-\dfrac{1}{8}-\dfrac{1}{12345}\)
\(=\left(\dfrac{1}{12345}-\dfrac{1}{12345}\right)+\left(-3\dfrac{3}{4}+3\dfrac{3}{4}\right)+\left(0,125-\dfrac{1}{8}\right)\)
\(=0+0+\left(\dfrac{1}{8}-\dfrac{1}{8}\right)\)
\(=0\)
#Toru
( 0,25 )8 = \(\left(\frac{1}{4}\right)^8=\left(\frac{1}{2^2}\right)^8=\left(\frac{1}{2}\right)^{16}=\left(0,5\right)^{16}\)
( 0,125 )4 = \(\frac{1}{8}^4=\left(\frac{1}{2^3}\right)^4=\left(\frac{1}{2}\right)^{12}=\left(0,5\right)^{12}\)
0,258 = (0,52)8 = 0,516
0,1254 = (0,53)4 = 0,512
_HT_
\(\left(0,125\right)^4.8^4\)
=\(\left(0,125.8\right)^4\)
=\(1^4\)=1