(-72)x{1|4-5|9+7|12}除以(-2)_数学解答

(-72)x{1|4-5|9+7|12}除以(-2)

人气：471 ℃　时间：2020-02-04 09:24:45

解答

(-72)x{1/4-5/9+7/12}÷(-2)
=(-72)÷（-2）x{1/4-5/9+7/12}
=36x{1/4-5/9+7/12}
=36×1/4-36×5/9+36×7/12
=9-20+21
=10