题目内容

(1)(48-3÷0.25)×
4
9
      (2)10.5×20%-4.8×25%
(3)
1
3
×
9
20
÷(1÷
1
2
)      (4)728+900÷18×8.4.
(1)(48-3÷0.25)×
4
9

=(48-12)×
4
9

=36×
4
9

=16;

(2)10.5×20%-4.8×25%,
=10.5×
1
5
-4.8×
1
4

=2.1-1.2,
=0.9;

(3)
1
3
×
9
20
÷(1÷
1
2
),
=
3
20
÷(1×2),
=
3
20
÷2,
=
3
20
×
1
2

=
3
40


(4)728+900÷18×8.4,
=728+50×8.4,
=728+420,
=1148.
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