问题 解答题
直接写得数.
8.1+
1
4
=
72÷0.4=412-198=0.5-
1
5
+0.5-
1
5
=
1
4
+
1
3
)×24=
1-
2
5
+
3
5
=
3
2
×
2
3
=
3
4
×1÷
3
4
=
1.25×8=9-0.9=
答案

①8.1+

1
4
=8.35;②72÷0.4=180;③412-198=214;④0.5-
1
5
+0.5-
1
5
=0.6; ⑤(
1
4
+
1
3
)×24=14;

⑥1-

2
5
+
3
5
=1
1
5
;⑦1÷
3
2
×
2
3
=
4
9
;⑧1÷
3
4
×1÷
3
4
=
16
9
;⑨1.25×8=10; ⑩9-0.9=8.1.

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