a: =250:{5*(78-28)}
=250:{5*50}
=1
b: \(=3\cdot\left\{150:\left[152-77\right]\right\}\)
=3*{150:75}
=3*2=6
c: \(=12:\left\{390:\left[500-125-245\right]\right\}\)
=12:3=4
d: =100-[16*5+88]:28
=100-6=94
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