题目内容

计算下列各题.(能简算的要简算)
3.8-1.9+7.2-8.1
7
8
+
5
8
)÷
3
7
÷15=
40-(7.7+4.8÷1.2)
3
29
+
1
13
)×13×29=

(1)3.8-1.9+7.2-8.1,
=(3.8+7.2)-(1.9+8.1),
=11-10,
=1;

(2)(
7
8
+
5
8
)÷
3
7
÷15,
=
3
2
÷
3
7
÷15,
=
7
2
÷15,
=
7
30


(3)40-(7.7+4.8÷1.2),
=40-(7.7+4),
=40-11.7,
=28.3;

(4)(
3
29
+
1
13
)×13×29,
=
3
29
×13×29+
1
13
×13×29,
=39+29,
=68.
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