计算下列各题. 200.9-39.5+60.5 1.25×32×2.5 34÷(38+112) 2000×19992001 (56+54?12)÷
计算下列各题.200.9-39.5+60.51.25×32×2.534÷(38+112)2000×19992001(56+54?12)÷2512119×58?29÷85....
计算下列各题. 200.9-39.5+60.5 1.25×32×2.5 34÷(38+112) 2000×19992001 (56+54?12)÷2512 119×58?29÷85.
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(1)200.9-39.5+60.5
=161.4+60.5
=221.9;
(2)1.25×32×2.5
=(1.25×8)×(4×2.5)
=10×10
=100;
(3)
÷(
+
)
=
÷
=1
;
(4)2000×
=2001×
-1×
=1999-
=1998
;
(5)(
+
?
)÷
=
×
+
×
-
×
=
+
-
=
;
(6)
×
?
÷
=(
-
)×
=1×
=161.4+60.5
=221.9;
(2)1.25×32×2.5
=(1.25×8)×(4×2.5)
=10×10
=100;
(3)
3 |
4 |
3 |
8 |
1 |
12 |
=
3 |
4 |
11 |
24 |
=1
7 |
11 |
(4)2000×
1999 |
2001 |
=2001×
1999 |
2001 |
1999 |
2001 |
=1999-
1999 |
2001 |
=1998
2 |
2001 |
(5)(
5 |
6 |
5 |
4 |
1 |
2 |
25 |
12 |
=
5 |
6 |
12 |
25 |
5 |
4 |
12 |
25 |
1 |
2 |
12 |
25 |
=
2 |
5 |
3 |
5 |
6 |
25 |
=
19 |
25 |
(6)
11 |
9 |
5 |
8 |
2 |
9 |
8 |
5 |
=(
11 |
9 |
2 |
9 |
5 |
8 |
=1×
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