试题:
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:

我来补答
(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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