题目内容

怎样简便怎样算.
(1)0.625×(8.3-2.5×0.12)(2)3÷
3
7
-
3
7
÷3
(3)3098+3098×99
(4)6.3×8.7+8.7×3.7(5)2.5×1.25×32(6)
9
7
-
1
3
-
2
3
(1)0.625×(8.3-2.5×0.12),
=0.625×(8.3-0.3),
=0.625×8,
=5;

(2)3÷
3
7
-
3
7
÷3,
=7-
1
7

=6
6
7


(3)3098+3098×99,
=3098×(1+99),
=3098×100,
=309800;

(4)6.3×8.7+8.7×3.7,
=(6.3+3.7)×8.7,
=10×8.7,
=87;

(5)2.5×1.25×32,
=2.5×1.25×(4×8),
=(2.5×4)×(1.25×8),
=10×10,
=100;

(6)
9
7
-
1
3
-
2
3

=
9
7
-(
1
3
+
2
3
),
=
9
7
-1,
=
2
7
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