题目内容
计算.
| 13×
| (
|
| ||||||||||||||||||||
| 120.8×2.75-0.8×2.75 | 8×1.2×1.25×
|
|
(1)
÷15×
×24,
=
×
×
×24,
=
;
(2)13×
+
×22,
=(13+22)×
,
=35×
,
=30;
(3)(
+
+
)×60,
=
×60+
×60+
×60,
=30+6+5,
=36+5,
=41;
(4)
×
+
÷7,
=
×
+
×
,
=(
+5)×
,
=1×
,
=
;
(5)
÷
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
═
;
(6)120.8×2.75-0.8×2.75,
=(120.8-0.8)×2.75,
=120×2.75,
=330;
(7)8×1.2×1.25×
,
=(8×1.25)×(1.2×
),
=10×0.4,
=4;
(8)
×13-13×25%,
=(
-25%)×13,
=0.5×13,
=6.5.
| 15 |
| 12 |
| 12 |
| 17 |
=
| 15 |
| 12 |
| 1 |
| 15 |
| 12 |
| 17 |
=
| 24 |
| 17 |
(2)13×
| 6 |
| 7 |
| 6 |
| 7 |
=(13+22)×
| 6 |
| 7 |
=35×
| 6 |
| 7 |
=30;
(3)(
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 12 |
=
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 12 |
=30+6+5,
=36+5,
=41;
(4)
| 3 |
| 5 |
| 1 |
| 7 |
| 2 |
| 5 |
=
| 3 |
| 5 |
| 1 |
| 7 |
| 2 |
| 5 |
| 1 |
| 7 |
=(
| 3 |
| 5 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(5)
| 2 |
| 7 |
| 4 |
| 9 |
| 5 |
| 7 |
| 4 |
| 9 |
=
| 2 |
| 7 |
| 9 |
| 4 |
| 5 |
| 7 |
| 9 |
| 4 |
=(
| 2 |
| 7 |
| 5 |
| 7 |
| 9 |
| 4 |
=1×
| 9 |
| 4 |
═
| 9 |
| 4 |
(6)120.8×2.75-0.8×2.75,
=(120.8-0.8)×2.75,
=120×2.75,
=330;
(7)8×1.2×1.25×
| 1 |
| 3 |
=(8×1.25)×(1.2×
| 1 |
| 3 |
=10×0.4,
=4;
(8)
| 3 |
| 4 |
=(
| 3 |
| 4 |
=0.5×13,
=6.5.
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