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In the fifth grade of mathematics, the fourth question on page 52 of Huanggang Small Champion is to cultivate excellent students' homework.
(1)24 times 15 divided by 2 equals 180.
24 times (15 divided by 3) divided by 2 equals 60.
180 minus 60 equals 120.
(4)90 times 70 divided by 2 times 180 equals 567000.