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