4/9*{3/4-{7/16-1/4}}
问题描述:
4/9*{3/4-{7/16-1/4}}
答
4/9*{3/4-{7/16-1/4}}
括号中式子化解得:=4/9*{3/4-{7/16-4/16}}
=4/9*{3/4-3/16}
=4/9*{12/16-3/16}
=4/9*9/16
=1/4
亲,答案是1/4