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nhiều thế!!!
a/82.8.18=83.1=512
b/2.22.23.12.120=26.1.1=64
c/82.13=64.1=64
d/72.13=49.1=49
e/52.(19990)2016=52.12016=25.1=25
f/42.12016=16.1=16
g/92.20160=81.1=81
h/102.20160=100.1=100
F = 20 + 21 + 22 + 23 + 20.21.22.23
F = 1 + 2 + 4 + 8 + 20 + 1 + 2 + 3
F = 15 + 26
F = 15 + 64
F = 79
\(A=2^0+2^1+2^2+.....+2^{1990}\)
\(2A=2\left(2^0+2^1+2^2+.....+2^{1990}\right)\)
\(2A=2^1+2^2+2^3+.....+2^{1991}\)
\(2A-A=\left(2^1+2^2+2^3+.....+2^{1991}\right)-\left(2^0+2^1+2^2+.....+2^{1990}\right)\)
\(A=2^{1991}-2^0=2^{1991}-1\)
\(B=a^0+a^1+a^2+a^3+.....+a^n\)
\(B.a=a^1+a^2+a^3+a^4+.....+a^{n+1}\)
\(B.a-B=\left(a^1+a^2+a^3+a^4+......+a^{n+1}\right)-\left(a^0+a^1+a^2+a^3+.....+a^n\right)\)
\(B.a=a^{n+1}-1\Leftrightarrow B=\dfrac{a^{n+1}-1}{a}\)
\(C=1+3+3^2+.....+3^{50}\)
\(3C=3\left(1+3+3^2+.....+3^{50}\right)\)
\(3C=3+3^2+3^3+.....+3^{51}\)
\(3C-C=\left(3+3^2+3^3+.....+3^{51}\right)-\left(1+3+3^2+.....+3^{50}\right)\)
\(2C=3^{51}-1\Rightarrow C=\dfrac{3^{51}-1}{2}\)
trả lời
(22+21+22+23)*20+21+22+23=1826
chúc bn
hc tốt
\(\left(2^2+2^1+2^2+2^3\right).2^0.2^1.2^2.2^3\)
\(=18.64\)
\(=1152\)
A = 20 + 21 + 22 + 23 + 20 + 21 + 22 + 23 = 2.(20 + 21 + 22 + 23) = 2.(1 + 2 + 4 + 8) = 2.15 = 30
A = ( 20 + 21 + 22 + 23 ) x 2
A = ( 0+ 2 + 4 + 8 ) x 2
A = 14 x 2
A = 28
Vậy A = 28
cho biểu thức đó là B
\(B=\left(2^0+2^1+2^2+2^3\right).2^0.2^1.2^2.2^3\)
\(B=\left(1+2+4+8\right).1.2.4.8\)
\(B=[\left(8+2\right)+\left(4+1\right)].1.2.4.8\)
\(B=\left(10+5\right).1.2.4.8\)
\(B=15.1.2.4.8\)
\(B=\left(15.2\right).\left(4.8\right)\)
\(B=960\)
960 nha