题目内容
| 下面各题,怎样简便就怎样算. 4×4.9×25 |
| 7.6×99 | ||||||||||||||
| 720÷15÷6 |
| ||||||||||||||
| (6+
|
(1)4×4.9×25,
=(4×25)×4.9,
=4.9×100,
=490;
(2)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)7.6×99,
=7.6×(100-1),
=7.6×100-7.6,
=760-7.6,
=752.4;
(4)
÷[
×(
+
)],
=
÷[
×(
+
)];
=
÷
,
=
×10,
=
,
=1
;
(5)720÷15÷6,
=720÷(15×6),
=720÷90,
=8;
(6)
+
÷
,
=
+
×6,
=
+4,
=4
;
(7)
+
+0.6+
,
=(
+
)+(
+
),
=1+1,
=2;
(8)(6+
)÷3,
=(6+
)×
,
=6×
+
×
,
=2+
,
=2
.
=(4×25)×4.9,
=4.9×100,
=490;
(2)
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 4 |
| 3 |
=
| 5 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
(3)7.6×99,
=7.6×(100-1),
=7.6×100-7.6,
=760-7.6,
=752.4;
(4)
| 1 |
| 8 |
| 1 |
| 5 |
| 2 |
| 5 |
| 1 |
| 10 |
=
| 1 |
| 8 |
| 1 |
| 5 |
| 4 |
| 10 |
| 1 |
| 10 |
=
| 1 |
| 8 |
| 1 |
| 10 |
=
| 1 |
| 8 |
=
| 5 |
| 4 |
=1
| 1 |
| 4 |
(5)720÷15÷6,
=720÷(15×6),
=720÷90,
=8;
(6)
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 3 |
=4
| 2 |
| 3 |
(7)
| 2 |
| 5 |
| 3 |
| 7 |
| 4 |
| 7 |
=(
| 2 |
| 5 |
| 3 |
| 5 |
| 3 |
| 7 |
| 4 |
| 7 |
=1+1,
=2;
(8)(6+
| 3 |
| 8 |
=(6+
| 3 |
| 8 |
| 1 |
| 3 |
=6×
| 1 |
| 3 |
| 3 |
| 8 |
| 1 |
| 3 |
=2+
| 1 |
| 8 |
=2
| 1 |
| 8 |
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