1⼀2x[3⼀4-(1⼀2-1⼀4)]要过程?

2024-12-18 10:46:42
推荐回答(2个)
回答1:

见图

回答2:

=1/2×(3/4-1/2+1/4)
=1/2×(1-1/2)
=1/2×1/2
=1/4