题目内容

口算.
0.5×0.5=
7×60%= 1-50%= A÷A=
0÷3=
5
7
×
2
5
=
1
2
-
1
3
=
75%-
1
2
=
0.5×0.5=0.25, 7×60%,=4.2, 1-50%=0.5, A÷A=1,
0÷3=0,
5
7
×
2
5
=
2
7
1
2
-
1
3
=
1
6
75%-
1
2
=0.25,
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