题目内容

简便计算.
(1)13
5
7
-5.8+3
2
7
+4.2 (2)7.7÷1
1
3
+0.75×4
3
10


(3)(
5
6
-0.25+
1
3
)×2.4(4)2
1
2
×4.625+6
3
8
×250%-2.5.
(1)13
5
7
-5.8+3
2
7
+4.2
=(13
5
7
+3
2
7
)-5.8+4.2
=17-5.8+4.2
=15.4;
(2)7.7÷1
1
3
+0.75×4
3
10

=7.7÷
4
3
+0.75×4
3
10

=7.7×
3
4
+0.75×4
3
10

=7.7×0.75+0.75×4
3
10

=0.75×(7.7+4
3
10

=0.75×(7
7
10
+4
3
10

=0.75×12
=9;
(3)(
5
6
-0.25+
1
3
)×2.4
=(
5
6
-
1
4
+
1
3
)×2.4
=
5
6
×2.4-
1
4
×2.4+
1
3
×2.4
=5×0.4-0.6+0.8
=2-0.6+0.8
=2.2;
(4)2
1
2
×4.625+6
3
8
×250%-2.5
=2.5×4.625+6.375×2.5-2.5
=2.5×(4.625+6.375-2.5)
=2.5×8.5
=21.25.
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