(1)532-75×4÷25
=532-300÷25
=532-12
=520
(2)24+3.2+4.8+76
=(24+76)+(3.2+4.8)
=100+8
=108
(3)56.21-6.84-3.16
=56.21-(6.84+3.16)
=56.21-10
=46.21
(4)9.5-6.13+4.85
=3.37+4.85
=8.22
(5)(178+80)÷(142-99)
=258÷43
=6
(6)18×236-136×18
=18×(236-136)
=18×100
=1800.