(1) (15+8)*4/2-4*4*3.14/2
=46-6.28=39.72
(2) 10*5-5*5*3.14/2+5*5*3.14/2-10*5/2
=50-25=25
(3) 8*8*3.14/4-4*4*3.14/2
=(16-8)*3.14=8*3.14=25.12
(4) 6*6-6*6*3.14/4+6*6*3.14/4
=36
(1) (15+8)*4/2-4*4*3.14/2
=46-6.28=39.72
(2) 10*5-5*5*3.14/2+5*5*3.14/2-10*5/2
=50-25=25
(3) 8*8*3.14/4-4*4*3.14/2
=(16-8)*3.14=8*3.14=25.12
(4) 6*6-6*6*3.14/4+6*6*3.14/4
=36