50%+7/12−1/2
\(= \frac{1}{2} + \frac{7}{12} - \frac{1}{2}\)
\(= \left(\right. \frac{1}{2} - \frac{1}{2} \left.\right) + \frac{7}{12}\)
\(= \frac{7}{12}\)
(-25)(4 - 40) + 2022^0
= -25.4 + 25.40 + 1
= -100 + 1000 + 1
= 900 + 1
= 901
a, (2022 + 169) - ( 2022 - 31)
= 2022 + 169 - 2022 + 31
= 2022+ 169 + (-2022) + 31
= { 2022 + (-2022)} + ( 169 + 31)
= 0 + 200
= 200.
2020