题目内容

计算下面各题,能简算的要简算.
67×
4
11
-
4
11

1.9-1.9×(1.9-1.9)
0.7+3.9+4.3+6.1
8
9
×[
3
4
-(
7
16
-
1
4
)]
(1)67×
4
11
-
4
11

=(66+1)×
4
11
-
4
11

=66×
4
11
+1×
4
11
-
4
11

=24+
4
11
-
4
11

=24;

(2)1.9-1.9×(1.9-1.9),
=1.9-1.9×0,
=1.9-0,
=1.9;

(3)0.7+3.9+4.3+6.1,
=(0.7+4.3)+(3.9+6.1),
=5+10,
=15;

(4)
8
9
×
[
3
4
-
7
16
-
1
4
)],
=
8
9
×
[
3
4
+
1
4
-
7
16
],
=
8
9
×
[1-
7
16
],
=
8
9
×
9
16

=
1
2
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