题目内容
计算下面各题,能简算的必须简算.
87×
|
|
24×(
| ||||||||||||||||||
|
|
(
|
(1)87×
=(86+1)×
=86×
+1×
=3+
=3
;
(2)
×
÷
=
×
=
;
(3)24×(
+
+
)
=24×
+24×
+24×
=9+4+10
=23;
(4)
÷5+
×
=
×
+
×
=(
+
)×
=1×
=
;
(5)
×0.375÷
=
×
÷
=
÷
=
;
(6)(
-
)×(
+
)
=
×
=
.
| 3 |
| 86 |
=(86+1)×
| 3 |
| 86 |
=86×
| 3 |
| 86 |
| 3 |
| 86 |
=3+
| 3 |
| 86 |
=3
| 3 |
| 86 |
(2)
| 5 |
| 6 |
| 1 |
| 15 |
| 7 |
| 18 |
=
| 1 |
| 18 |
| 18 |
| 7 |
=
| 1 |
| 7 |
(3)24×(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10
=23;
(4)
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=
| 1 |
| 3 |
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
=(
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 5 |
=1×
| 1 |
| 5 |
=
| 1 |
| 5 |
(5)
| 2 |
| 9 |
| 6 |
| 7 |
=
| 2 |
| 9 |
| 3 |
| 8 |
| 6 |
| 7 |
=
| 1 |
| 12 |
| 6 |
| 7 |
=
| 7 |
| 72 |
(6)(
| 3 |
| 4 |
| 3 |
| 16 |
| 2 |
| 9 |
| 1 |
| 3 |
=
| 9 |
| 16 |
| 5 |
| 9 |
=
| 5 |
| 16 |
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