题目内容
我能用简便方法计算.
86×
| (
|
|
(1)86×
,
=(85+1)×
,
=85×
+1×
,
=2+
,
=2
;
(2)(
+
+
)÷
,
=(
+
+
)×12,
=
×12+
×12+
×12,
=8+9+2,
=19;
(3)
×37.5%+
×
+
÷
,
=
×
+
×
+
×
,
=(
+
+
)×
,
=(
+
+
)×
,
=2×
,
=
.
| 2 |
| 85 |
=(85+1)×
| 2 |
| 85 |
=85×
| 2 |
| 85 |
| 2 |
| 85 |
=2+
| 2 |
| 85 |
=2
| 2 |
| 85 |
(2)(
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
=(
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 6 |
=8+9+2,
=19;
(3)
| 1 |
| 2 |
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 10 |
| 8 |
| 3 |
=
| 1 |
| 2 |
| 3 |
| 8 |
| 4 |
| 5 |
| 3 |
| 8 |
| 7 |
| 10 |
| 3 |
| 8 |
=(
| 1 |
| 2 |
| 4 |
| 5 |
| 7 |
| 10 |
| 3 |
| 8 |
=(
| 5 |
| 10 |
| 8 |
| 10 |
| 7 |
| 10 |
| 3 |
| 8 |
=2×
| 3 |
| 8 |
=
| 3 |
| 4 |
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