题目内容
用简便方法计算下面各题
(1)
+
+
+
(2)
×
+
×
(3)4.3×11.8+86×0.91
(4)7.46×36+74.6×6.4.
(1)
| 44 |
| 5 |
| 21 |
| 4 |
| 6 |
| 5 |
| 11 |
| 4 |
(2)
| 23 |
| 4 |
| 3 |
| 7 |
| 27 |
| 4 |
| 3 |
| 7 |
(3)4.3×11.8+86×0.91
(4)7.46×36+74.6×6.4.
(1)
+
+
+
,
=(
+
)+(
+
),
=10+8,
=18;
(2)
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)4.3×11.8+86×0.91,
=43×1.18+43×1.82,
=43×(1.18+1.82),
=43×3,
=129;
(4)7.46×36+74.6×6.4,
=74.6×3.6+74.6×6.4,
=74.6×(3.6+6.4),
=74.6×10,
=746.
| 44 |
| 5 |
| 21 |
| 4 |
| 6 |
| 5 |
| 11 |
| 4 |
=(
| 44 |
| 5 |
| 6 |
| 5 |
| 21 |
| 4 |
| 11 |
| 4 |
=10+8,
=18;
(2)
| 23 |
| 4 |
| 3 |
| 7 |
| 27 |
| 4 |
| 3 |
| 7 |
=(
| 23 |
| 4 |
| 27 |
| 4 |
| 3 |
| 7 |
=
| 25 |
| 2 |
| 3 |
| 7 |
=
| 75 |
| 14 |
(3)4.3×11.8+86×0.91,
=43×1.18+43×1.82,
=43×(1.18+1.82),
=43×3,
=129;
(4)7.46×36+74.6×6.4,
=74.6×3.6+74.6×6.4,
=74.6×(3.6+6.4),
=74.6×10,
=746.
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