问题 解答题
怎样算简便就怎样算.
①46×8-120÷15
4
9
×
6
7
+
4
9
÷7
③6.28+7.13-(5.13+3.28)
2
3
+(
4
5
-
2
3
5
3

⑤(12.5×8-40)÷0.6
⑥(
5
12
-
1
9
+
3
8
)×72.
答案

①46×8-120÷15,

=368-8,

=360;

4
9
×
6
7
+
4
9
÷7,

=

4
9
×
6
7
+
4
9
×
1
7

=(

6
7
+
1
7
)×
4
9

=1×

4
9

=

4
9

③6.28+7.13-(5.13+3.28),

=6.28+7.13-5.13-3.28,

=(6.28-3.28)+(7.13-5.13),

=3+2,

=5;

2
3
+(
4
5
-
2
3
5
3

=

2
3
+
4
5
×
5
3
-
2
3
×
5
3

=

2
3
+
4
3
-
10
9

=2-

10
9

=

8
9

⑤(12.5×8-40)÷0.6,

=(100-40)÷0.6,

=60÷0.6,

=100;

⑥(

5
12
-
1
9
+
3
8
)×72,

=

5
12
×72-
1
9
×72+
3
8
×72,

=30-8+27,

=22+27,

=49.

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