
(1)13.6×3-40.6÷2,
=40.8-20.3,
=20.5;
(2)99×0.75+×99,
=99×(0.75+0.25),
=99×1,
=99;
(3)(?)×24,
=×24-×24,
=20-15,
=5;
(4)121×100,
=121×(100+),
=121×100+121×,
=12100+1,
=12101;
(5)15÷3?7×(+),
=15÷3-7×,
=5-1,
=3;
(6)24÷6?,=4-,=4.

(1)13.6×3-40.6÷2,
=40.8-20.3,
=20.5;
(2)99×0.75+×99,
=99×(0.75+0.25),
=99×1,
=99;
(3)(?)×24,
=×24-×24,
=20-15,
=5;
(4)121×100,
=121×(100+),
=121×100+121×,
=12100+1,
=12101;
(5)15÷3?7×(+),
=15÷3-7×,
=5-1,
=3;
(6)24÷6?,=4-,=4.