bachcat23
幼苗
共回答了15个问题采纳率:86.7% 举报
(1)X-
2
5 X=18,
3
5 X=18,
3
5 X ÷
3
5 =18 ÷
3
5 ,
X=30; (2)X-10%X=27,
90%X=27,
0.9X=27,
0.9X÷0.9=27÷0.9,
X=30;
(3)62.5%X+
1
8 =
3
4 ,
62.5%X+
1
8 -
1
8 =
3
4 -
1
8 ,
62.5%X=
5
8 ,
0.625X=
5
8 ,
0.625X÷0.625=
5
8 ÷0.625,
X=1.
1年前
7