Bài 2:
\(a,=75\left(37+52\right)+89\left(46-21\right)=75\cdot89+89\cdot25=89\left(75+25\right)=8900\\ b,=\left(36+64\right)+\left(173+27\right)=100+200=300\\ c,=81-3\left(23+4\right)=81-3\cdot27=0\\ d,=1037:17+1=61+1=62\)
Bài 3:
\(a,\Rightarrow\left(x-3\right):5=36-32=4\\ \Rightarrow x-3=20\\ \Rightarrow x=23\\ b,\Rightarrow3x+5=\dfrac{60}{12}=5\\ \Rightarrow3x=0\\ \Rightarrow x=0\\ c,\Rightarrow\left[{}\begin{matrix}3^x=81=3^4\\6x=-12\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=4\\x=-2\end{matrix}\right.\\ d,\Rightarrow\left[{}\begin{matrix}2x-1=9\\1-2x=9\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=5\\x=-4\end{matrix}\right.\)
Bài 3:
Vì \(ƯCLN\left(80,36,104\right)=4\) nên cô chia đc nhiều nhất vào 4 đĩa.
Khi đó mỗi đĩa có \(80:4=20\left(táo\right);36:4=9\left(hồng\right);104:4=26\left(mận\right)\)