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\(A=\frac{-3}{5}+\left(\frac{-2}{5}+2\right)\)
\(A=\frac{-3}{5}+\frac{8}{5}\)
\(A=1\)
\(B=\frac{3}{7}+\left(\frac{-1}{5}+\frac{-3}{7}\right)\)
\(B=\frac{3}{7}+\frac{-1}{5}+\frac{-3}{7}\)
\(B=\left(\frac{3}{7}+\frac{-3}{7}\right)+\frac{-1}{5}\)
\(B=0+\frac{-1}{5}\)
\(B=\frac{-1}{5}\)
\(C=\frac{-7}{9}.\frac{4}{11}+\frac{-7}{9}.\frac{7}{11}+\frac{52}{9}\)
\(C=\frac{-7}{9}.\left(\frac{4}{11}+\frac{7}{11}\right)+\frac{52}{9}\)
\(C=\frac{-7}{9}.1+\frac{52}{9}\)
\(C=\frac{-7}{9}+\frac{52}{9}\)
\(C=5\)
\(D=50\%.\frac{4}{3}.10.\frac{7}{35}.0,75\)
\(D=\frac{50}{100}.\frac{4}{3}.10.\frac{7}{35}.\frac{75}{100}\)
\(D=\frac{1}{2}.\frac{4}{3}.10.\frac{1}{5}.\frac{3}{4}\)
\(D=\left(\frac{1}{2}.\frac{1}{5}.10\right).\left(\frac{4}{3}.\frac{3}{4}\right)\)
\(D=1.1\)
\(D=1\)
A= 1
B= -1/5
C=5
D=1
mik có ý kiến lần sau bạn đặt câu hỏi nhớ ghi phân số trên dưới cho dễ nhìn nha
\(=\dfrac{2^{10}\cdot3^8-2^{10}\cdot3^9}{2^{10}\cdot3^6+2^{16}\cdot3^9}=\dfrac{2^{10}\cdot3^8\left(1-3\right)}{2^{10}\cdot3^6\left(1+2^6\cdot3^3\right)}=\dfrac{3^2\cdot\left(-2\right)}{1+64\cdot27}=\dfrac{-18}{1729}\)
\(\frac{2^{10}.3^8-2^8.3^9.4}{2^{10}.3^6.9+2^{10}.3^9}=\frac{2^{10}.\left(3^8-3^9\right)}{2^{10}\left(3^9-3^9\right)}=\frac{3^8-3^9}{3^9-3^9}=\frac{3^8\left(1-3\right)}{3^9\left(1-1\right)}=\frac{3^8.\left(-2\right)}{3^9.0}=0\)
a, 2^9 . 4^5
=2^9 . (2^2)^5
= 2^9. 2^10
=2^19
b, 27^4 :81^3
=(3^3)^4 : (3^4)^3
= 3^12 : 3^12
= 1
c,72^5 :9^5
= (2^3 . 3^2)^5 :(3^2)^5
= 2^10. 3^10 : 3^10
= 2^10
Học tốt ~
\(a,2^9.4^5=2^9.\left(2^2\right)^5=2^9.2^{10}=2^{19}\)
\(b,27^4:81^3=\left(3^3\right)^4:\left(3^4\right)^3=3^{12}:3^{12}=1\)
\(c,72^5:9^5=\left(72:9\right)^5=8^5\)
ta có:\(x-\frac{1}{4}=\frac{5}{8}\cdot\frac{2}{3}\)
=>\(x-\frac{1}{4}=\frac{5}{12}\)
=>\(\frac{2}{3}\)
b)\(\frac{x}{126}=\frac{-20}{63}\)
=>\(\frac{x}{126}=\frac{-40}{126}\)
=>x=-40
2n+3 + 2n = 144
<=> 2n(23 + 1 ) = 144
<=> 2n.9 = 144
<=> 2n = 16
<=> 2n = 24
<=> n= 4
2n+ 4.2 n+1 = 9.43
<=> 2n + 2n+3 = 9.26
<=> 2n( 1 + 23 ) = 9.26
<=> 2n.9 = 9.26
<=> 2n = 26
<=> n = 6
#_W
Tìm n
a) 2n + 3 + 2n = 144
=> 2n.23 + 2n = 144
=> 2n.8 + 2n = 144
=> 2n.(8 + 1) = 144
=> 2n.9 = 144
=> 2n = 144 : 9
=> 2n = 16
=> 2n = 24
=> n = 4
Vậy n = 4
b) 2n + 4.2n + 1 = 9.43
=> 2n + 22.2n + 1 = 9.(22)3
=> 2n + 2n + 3 = 9.22.3
=> 2n + 2n.23 = 9.26
=> 2n + 2n.8 = 9.26
=> 2n.(1 + 8) = 9.26
=> 2n.9 = 9.26
=> 2n = 26
=> n = 6
Vậy n = 6
giup minh voi
9.42-7.(-2)3=9.16-7.(-8)=144+56=200