问题 解答题
怎样简便就怎样算.
(1)8470-104×65 (2)1.3-3.79+9.7-6.21
(3)3.64÷4+4.36×0.25(4)(
1
9
-
1
12
)×4×9
(5)
9
20
÷[
3
2
×(0.4+
4
5
)].
答案

(1)8470-104×65

=8470-6760

=1710;

(2)1.3-3.79+9.7-6.21

=1.3+9.7-(3.79+6.21)

=11-10

=1;

(3)3.64÷4+4.36×0.25

=3.64×0.25+4.36×0.25

=(3.64+4.36)×0.25

=8×0.25

=2;

(4)(

1
9
-
1
12
)×4×9

=(

1
9
-
1
12
)×36

=

1
9
×36-
1
12
×36

=4-3

=1;

(5)

9
20
÷[
3
2
×(0.4+
4
5
)]

=

9
20
÷[
3
2
×(
2
5
+
4
5
)]

=

9
20
÷[
3
2
×
6
5
]

=

9
20
÷
9
5

=

1
4

故答案为1710;1;2;1;

1
4

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