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a) 2x : 22 = 3.23 + 23
2x-2 = 23.(3+1) = 23.4=23.22 = 25
=> x -2 = 5
x = 7
b) 65.59+65.42 - 13.5
= 65.(59+42) - 13.5
= 65.101 - 13.5
= 65.101- 65
= 65.(101-1) = 65.100 = 6500
45-[(18-15)2 + 24 ]
= 45 - (32 + 24) = 45 - 25 = 20
\(65.59+65.42-13.5\)
\(\Rightarrow65.59+65.42-65\)
\(\Rightarrow65\left(59+42-1\right)=65.100=6500\)
65 . 59 + 65 . 42 - 13 . 5
= 65 . 59 + 65 . 42 - 65
= 65 . 59 + 65 . 42 - 65 . 1
= 65 . (59 + 42 - 1)
= 65 . 100
= 6500
#Học tốt!!!
~NTTH~
65 . 59 + 65 . 42 - 13 . 5
= 65 . 59 + 56 . 42 - 65
= 65 . ( 59 + 42 - 1 )
= 65 . 100
= 6500
65 . 59 + 65 . 42 - 13 . 5
= 65 . 59 + 56 . 42 - 65
= 65 . ( 59 + 42 - 1 )
= 65 . 100
= 6500
=(-259+259)+[(-74)+(-26)]+(-81+581)
=0+(-100)+500
=400
= -259 + 259 - 74 - 26 + 581 + 259 - 81
= 0 - 100 + 840 - 81
= 659
\(=45-\left(3^2+2^4\right)=45-\left(9+16\right)=45-25=20\)
b)\(=50+\left(30-2\left(14-3\right)\right)=50+\left(30-22\right)=50+8=58\)
\(1\frac{13}{15}.0,75-\left(\frac{104}{195}+25\%\right).\frac{24}{47}-3\frac{12}{13}:3\)
\(=\frac{28}{15}.\frac{3}{4}-\left(\frac{8}{15}+\frac{1}{4}\right).\frac{8}{9}-\frac{51}{13}.\frac{1}{3}\)
\(=\frac{7}{5}-\left(\frac{32}{60}+\frac{15}{60}\right).\frac{8}{9}-\frac{17}{13}\)
\(=\frac{7}{5}-\frac{47}{60}.\frac{8}{9}-\frac{17}{13}\)
\(=\frac{7}{5}-\frac{94}{135}-\frac{17}{13}\)
\(=\frac{-212}{351}\)
Tự quy đồng
\(2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)
\(=\frac{11}{4}.\frac{-2}{5}-\frac{8}{5}.\frac{11}{4}-\frac{6}{5}.\frac{11}{4}\)
\(=\frac{11}{4}.\left(\frac{-2}{5}-\frac{8}{5}-\frac{6}{5}\right)\)
\(=\frac{11}{4}.\frac{-16}{5}\)
\(=\frac{-44}{5}=-8\frac{4}{5}\)
\(65.59+65.41-32.4\)
\(=65.\left(59+41\right)-32.4\)
\(=65.100-128\)
\(=6500-128\)
\(=6372\)
65.59+65.41-32.4
=65.(59+41).32-4
=65.100.28
=6500.28
=176000