9.63-7.52-2.49+0.432000-1998+1996-1994+…-6+4-212×(0.875×12.4+1+4.4×78)×43-14[1-(112+12+110)×212]÷1125.-数学

题文

9.63-7.52-2.49+0.43 2000-1998+1996-1994+…-6+4-2
1
2
×(0.875×12.4+1+4.4×
7
8
)×
4
3
-
1
4
[1-(
1
12+
1
2
+
1
10
)×2
1
2
11
25
题型:解答题  难度:中档

答案

(1)9.63-7.52-2.49+0.43,
=(9.63+0.43)-(7.52+2.49),
=10.06-10.01,
=0.05;

(2)2000-1998+1996-1994+…-6+4-2,
=++…+(8-6)+(4-2),
=2×500,
=1000;

(3)
1
2
×(0.875×12.4+1+4.4×
7
8
)×
4
3
-
1
4

=
2
3
×(
7
8
×12.4+1+4.4×
7
8
)-
1
4

=
2
3
×[(12.4+4.4)×
7
8
+1]-
1
4

=
2
3
×[16.8×
7
8
+1]-
1
4

=
2
3
×[14.7+1]-
1
4

=
2
3
×15.7-
1
4

=