(1)180÷9-18,
=20-18,
=2;
(2)(48+52)÷5,
=100÷5,
=20;
(3)100-25×4,
=100-100,
=0;
(4)20+80×3,
=20+240,
=260;
(5)7×(34+56),
=7×90,
=630;
(6)105×2×5,
=105×(2×5),
=105×10,
=1050.
(1)180÷9-18,
=20-18,
=2;
(2)(48+52)÷5,
=100÷5,
=20;
(3)100-25×4,
=100-100,
=0;
(4)20+80×3,
=20+240,
=260;
(5)7×(34+56),
=7×90,
=630;
(6)105×2×5,
=105×(2×5),
=105×10,
=1050.