题目内容
用递等式计算,能简算的要简算.
(1)8470-104×65
(2)1.28+9.8+9.72+10.2
(3)168.1÷(4.3×2-0.4)
(4)
×
+
÷
(5)(
+
)×20.
(1)8470-104×65
(2)1.28+9.8+9.72+10.2
(3)168.1÷(4.3×2-0.4)
(4)
| 5 |
| 7 |
| 1 |
| 7 |
| 6 |
| 7 |
| 7 |
| 5 |
(5)(
| 4 |
| 5 |
| 1 |
| 4 |
(1)8470-104×65,
=8470-6760,
=1710;
(2)1.28+9.8+9.72+10.2,
=(1.28+9.72)+(9.8+10.2),
=11+20,
=31;
(3)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(4)
| 5 |
| 7 |
| 1 |
| 7 |
| 6 |
| 7 |
| 7 |
| 5 |
=
| 5 |
| 7 |
| 1 |
| 7 |
| 6 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 1 |
| 7 |
| 6 |
| 7 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
(5)(
| 4 |
| 5 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 1 |
| 4 |
=16+5,
=21.
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