试题:
用递等式计算(能简算的请简算)
①46.3-10.4+3.7-9.6
②18×7.9+0.18×210
8
17
÷23+
1
23
×
9
17

④1236+450÷18×15
⑤(
1
2
+
1
3
)÷
5
12
-
17
18

⑥36÷[
5
6
+(
5
8
-
1
3
)].

答案:

我来补答
①46.3-10.4+3.7-9.6,
=46.3+3.7-(10.4+9.6),
=50-20,
=30;

②18×7.9+0.18×210,
=18×7.9+18×2.1,
=(7.9+2.1)×18,
=10×18,
=180;

8
17
÷23+
1
23
×
9
17

=
8
17
×
1
23
+
1
23
×
9
17

=(
8
17
+
9
17
)×
1
23

=1×
1
23

=
1
23


④1236+450÷18×15,
=1236+25×15,
=1236+375,
=1611;

⑤(
1
2
+
1
3
)÷
5
12
-
17
18

=
5
6
×
12
5
-
17
18

=2-
17
18

=1
1
18


⑥36÷[
5
6
+(
5
8
-
1
3
)],
=36÷[
5
6
+
7
24
],
=36÷
9
8

=36×
8
9

=32.
 
 
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