a)4×A1+12
=4×5,5+12
=34
b)(23+A1)÷100
=(23+34)÷100
=0,57
c)2,5+A1÷100
=2,5+64÷100
=3,14
d)10×(3×A1-5)
=10×(3×25-5)
=700
