如题所述
第1个回答 2020-10-21
18×(5/6-4/7)×42
=18x5/6x42-18x4/7x42
=15x42-18x24
=630-432
=198
=18x5/6x42-18x4/7x42
=15x42-18x24
=630-432
=198
第2个回答 2020-10-21
18x(5/6 - 4/7)x42
=18x[(5/6)x42-(4/7)x42]
=18x(35-24)
=18x11
=198
=18x[(5/6)x42-(4/7)x42]
=18x(35-24)
=18x11
=198
