Bạn tách ra từng câu được không, dài quá bạn ơi
Bài 1:
\(B=\left\{6;7;8;9;10;11\right\}\)
Bài 2:
a)\(74+2021+26=\left(74+26\right)+2021=100+2021=2121\)
b) \(23.182+18.23=23\left(182+18\right)=23.200=4600\)
c) \(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.5^3-4.5^2\right)\right]\right\}=100:\left\{250:\left[450-4.5^2\left(5-1\right)\right]\right\}=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)
Bài 3:
a) \(43-4x=7\\ \Rightarrow4x=36\\ \Rightarrow x=9\)
b) \(3\left(x-2\right)+5=2^2.5\\ \Rightarrow3\left(x-2\right)=20-5\\ \Rightarrow x-2=15:3\\ \Rightarrow x=5+2\\ \Rightarrow x=7\)
