题目内容
| 19+2.4+2.91+14.6 |
| ||||||||||||||||||||
(
| 21÷(
| ||||||||||||||||||||
| . |
(1)19+2.4+2.91+14.6,
=(19+2.91)+(2.4+14.6),
=21.91+17,
=38.91;
(2)
×153-0.6×53,
=0.6×153-0.6×53,
=(153-53)×0.6,
=100×0.6,
=60;
(3)80.7×8.7+8.07×13,
=8.07×87+8.07×13,
=(87+13)×8.07,
=100×8.07,
=807;
(4)(
+
+
)×30,
=
×30+
×30+
×30,
=21+25+24,
=70;
(5)21÷(
+
)÷
,
=21÷
÷
,
=21×
×
,
=35;
(6)
÷[(
-
)÷
],
=
÷[
×
],
=
÷
,
=
×5,
=4.
=(19+2.91)+(2.4+14.6),
=21.91+17,
=38.91;
(2)
| 3 |
| 5 |
=0.6×153-0.6×53,
=(153-53)×0.6,
=100×0.6,
=60;
(3)80.7×8.7+8.07×13,
=8.07×87+8.07×13,
=(87+13)×8.07,
=100×8.07,
=807;
(4)(
| 7 |
| 10 |
| 5 |
| 6 |
| 4 |
| 5 |
=
| 7 |
| 10 |
| 5 |
| 6 |
| 4 |
| 5 |
=21+25+24,
=70;
(5)21÷(
| 1 |
| 3 |
| 2 |
| 5 |
| 9 |
| 11 |
=21÷
| 11 |
| 15 |
| 9 |
| 11 |
=21×
| 15 |
| 11 |
| 11 |
| 9 |
=35;
(6)
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 8 |
| 8 |
| 5 |
=
| 4 |
| 5 |
| 1 |
| 5 |
=
| 4 |
| 5 |
=4.
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