题目内容

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.
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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