题目内容

用递等式计算,能简便计算的要用简便方法计算.
38%×
3
5
+0.4×
19
50
89×6.3+48.9×0.3713
4
11
-(2
2
3
-1
7
11
2.5×
3
7
×0.4×2
1
3
158-92+42-883.2÷(83.2÷11)
(1)38%×
3
5
+0.4×
19
50

=0.38×0.6+0.4×0.38,
=(0.6+0.4)×0.38,
=0.38;

(2)89×6.3+48.9×0.37,
=560.7+18.093,
=578.793;

(3)13
4
11
-(2
2
3
-1
7
11
),
=13
4
11
+1
7
11
-2
2
3

=15-2
2
3

=12
1
3

(4)2.5×
3
7
×0.4×2
1
3

=(2.5×0.4)×(
3
7
×
7
3
),
=1×1,
=1;

(5)158-92+42-8,
=(158+42)-(92+8),
=200-100,
=100;

(6)83.2÷(83.2÷11),
=83.2÷83.2×11,
=11.
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