Câu 1:
\(A=35\left(34+86\right)+65\left(75+45\right)=35.120+65.120=120.100=12000\\ B=7^2\left(21-11+90\right)+125.16=49.100+2000=4900+2000=6900\\ C=2021:\left[639:\left(316-103\right):3\right]=2021:\left(639:213:3\right)=2021:1=2021\\ D=\dfrac{\left(98+2\right)\left[\left(98-2\right):2+1\right]}{2}=\dfrac{100.49}{2}=2450\)
Bài 3:
\(a,\Rightarrow5\left(x-1\right)=25\Rightarrow x-1=5\Rightarrow x=6\\ b,\Rightarrow2x+32=8^2=64\\ \Rightarrow2x=32\Rightarrow x=16\)
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