题目内容

脱式计算.
(2.8+4.6)×(2.6-2.)
0.25×(32+64)÷0.6
9
10
÷[
1
2
×(
6
5
-
3
10
)]
4
29
×[1-(
3
4
-
3
8
)].
①(2.8+4.6)×(2.6-2),
=7.4×0.6,
=4.44;

②0.25×(32+64)÷0.6,
=0.25×96÷0.6,
=0.25×4×24÷0.6,
=24÷0.6,
=40;

9
10
÷[
1
2
×(
6
5
-
3
10
)],
=
9
10
÷[
1
2
×(
12
10
-
3
10
)],
=
9
10
÷
9
20

=
9
10
×
20
9

=2;

4
29
×[1-(
3
4
-
3
8
)],
=
4
29
×[1-(
6
8
-
3
8
)],
=
4
29
×[1-
3
8
],
=
4
29
×
5
8

=
5
58
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