题目内容
能简算的要简算.
| (
| ||||||||||
| 7.89×16.5+21.1×1.65 |
|
(1)
×(1-75%)+
+0.25×
=
×(1-
)+
+
×
=
×
+
+
×
、
=(
+1+
)×
=2×
=
;
(2)(
+
)×7×5
=
×7×5+
×7×5
=10+7
=17;
(3)7.89×16.5+21.1×1.65
=78.9×16.5+21.1×1.65
=(78.9+21.1)×16.5
=100×16.5
=1650;
(4)
×[(
+
)÷
]
=
×[
×
]
=
×
×
=
.
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 7 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
=
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 8 |
=(
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 4 |
=2×
| 1 |
| 4 |
=
| 1 |
| 2 |
(2)(
| 2 |
| 7 |
| 1 |
| 5 |
=
| 2 |
| 7 |
| 1 |
| 5 |
=10+7
=17;
(3)7.89×16.5+21.1×1.65
=78.9×16.5+21.1×1.65
=(78.9+21.1)×16.5
=100×16.5
=1650;
(4)
| 5 |
| 11 |
| 2 |
| 5 |
| 1 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 11 |
| 11 |
| 15 |
| 6 |
| 5 |
=
| 5 |
| 11 |
| 11 |
| 15 |
| 6 |
| 5 |
=
| 2 |
| 5 |
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