题目内容

用递等式计算:
(
1
3
+
2
5
)×15

200-180÷15×6
(3.8-1.8÷2)×0.3
7
12
÷9+
1
9
×
5
12

8
15
×[(
3
4
-
1
2
3
5
]
①(
1
3
+
2
5
)×15
=
1
3
×15+
2
5
×15,
=5+6,
=11;
②200-180÷15×6
=200-12×6,
=200-72,
=128;
③(3.8-1.8÷2)×0.3
=(3.8-0.9)×0.3,
=2.9×0.3,
=0.87;
7
12
÷9+
1
9
×
5
12

=(
7
12
+
5
12
)×
1
9

=1×
1
9

=
1
9

8
15
×
3
4
-
1
2

=
8
15
×
3
4
-
8
15
×
1
2

=
6
15
-
4
15

=
2
15
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