题目内容

19+2.4+2.91+14.6
3
5
×153-0.6×5380.7×8.7+8.07×13.
(
7
10
+
5
6
+
4
5
)×30
21÷(
1
3
+
2
5
)÷
9
11
4
5
÷[(
5
8
-
1
2
)÷
5
8
]
(1)19+2.4+2.91+14.6,
=(19+2.91)+(2.4+14.6),
=21.91+17,
=38.91;

(2)
3
5
×153-0.6×53,
=0.6×153-0.6×53,
=(153-53)×0.6,
=100×0.6,
=60;

(3)80.7×8.7+8.07×13,
=8.07×87+8.07×13,
=(87+13)×8.07,
=100×8.07,
=807;

(4)(
7
10
+
5
6
+
4
5
)×30,
=
7
10
×30+
5
6
×30+
4
5
×30,
=21+25+24,
=70;

(5)21÷(
1
3
+
2
5
)÷
9
11

=21÷
11
15
÷
9
11

=21×
15
11
×
11
9

=35;

(6)
4
5
÷[(
5
8
-
1
2
)÷
5
8
],
=
4
5
÷[
1
8
×
8
5
],
=
4
5
÷
1
5

=
4
5
×5,
=4.
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