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a) (x + 73) - 26 = 76
x + 73 = 76 + 26 = 102
x = 102 - 73 = 29
b) 6x - 36 = 144 : 2
6x - 36 = 72
6x = 72+36 = 108
nhầm viết thêm nè
x = 108 : 6 = 18
c) 3^2 . (x+4) - 5^2 = 5.2^2
3^2.(x+4)-5^2=20
3^2.(x+4)=20+5^2=45
x+4=45:3^2=5
x=5-4=1
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A = 1 + 5 + 52 + 53 + . . . + 530
=> 5A = 1 + 5 + 52 + 53 + . . . + 531
=> 5A - A = 531 - 1
=> 4A = 531 - 1
=> 4A + 1 = 531
Mà : 4A + x = 531
=> x = 1
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\(\frac{2}{5}\)dm2 = 40 cm2
\(\frac{1}{10}\)m2 = 4000 cm2
90000 cm2 = 9 m2
\(\frac{1}{5}\)thế kỉ = 20 năm
36 kg 7 g = 36007 g
\(\frac{8}{15}+\frac{7}{13}+\frac{7}{15}+\frac{6}{13}\)
\(=\left(\frac{8}{15}+\frac{7}{15}\right)+\left(\frac{7}{13}+\frac{6}{13}\right)\)
\(=1+1=2\)
\(\frac{3}{4}-\frac{5}{12}-\frac{1}{12}\)
\(=\frac{3}{4}-\left(\frac{5}{12}+\frac{1}{12}\right)\)
\(=\frac{3}{4}-\frac{1}{2}\)
\(=\frac{3}{4}-\frac{2}{4}=\frac{1}{4}\)
\(\frac{7}{10}\times\frac{5}{12}-\frac{1}{5}\times\frac{5}{6}\)
\(=\frac{7}{24}-\frac{1}{6}=\frac{1}{8}\)
\(\frac{3}{5}\times\frac{3}{5}+\frac{3}{5}\times\frac{2}{5}\)
\(=\frac{3}{5}\times\left(\frac{3}{5}+\frac{2}{5}\right)\)
\(=\frac{3}{5}\times1=\frac{3}{5}\)
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\(\left(2x-12\right)\times2=2^3\)
\(\left(2x-12\right)\times2=8\)
\(2x-12=8:2\)
\(2x-12=4\)
\(2x=12+4\)
\(2x=16\)
\(x=16:2\)
\(x=8\)
@Nghệ Mạt
#cua
(2x - 12) * 2 = 23
=>4*(x-12) = 23
=>22(x-12)=23
=>x-12=2
=>x=14