题目内容

计算,能简算的要简算.
7.27-(1.98+0.27)23.4×18-23.4×883×
5
7
+2÷
7
5
-
5
7
1999÷1998×
1998
1999
39
100
×101-
39
100
(1)7.27-(1.98+0.27),
=7.27-0.27-1.98,
=7-1.98,
=5.02;

(2)23.4×18-23.4×8,
=23.4×(18-8),
=23.4×10,
=234;

(3)83×
5
7
+2÷
7
5
-
5
7

=83×
5
7
+2×
5
7
-
5
7

=(83+2-1)×
5
7

=84×
5
7

=60;

(4)1999÷1998×
1998
1999

=
1999
1998
×
1998
1999

=1;

(5)
39
100
×101-
39
100

=
39
100
×(101-1),
=
39
100
×100,
=39.
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