题目内容
简便运算.
17.15-8.47-1.53
(
+
+
)×72
187.7×11-187.7
0.48×100.1.
17.15-8.47-1.53
(
| 11 |
| 12 |
| 7 |
| 18 |
| 5 |
| 24 |
187.7×11-187.7
0.48×100.1.
(1)17.15-8.47-1.53,
=17.15-(8.47+1.53),
=17.15-10,
=7.15;
(2)(
+
+
)×72,
=
×72+
×72+
×72,
=66+28+15,
=94+15,
=109;
(3)187.7×11-187.7,
=187.7×(11-1),
=187.7×10,
=1877;
(4)0.48×100.1,
=0.48×(100+0.1),
=0.48×100+0.48×0.1,
=48+0.048,
=48.048.
=17.15-(8.47+1.53),
=17.15-10,
=7.15;
(2)(
| 11 |
| 12 |
| 7 |
| 18 |
| 5 |
| 24 |
=
| 11 |
| 12 |
| 7 |
| 18 |
| 5 |
| 24 |
=66+28+15,
=94+15,
=109;
(3)187.7×11-187.7,
=187.7×(11-1),
=187.7×10,
=1877;
(4)0.48×100.1,
=0.48×(100+0.1),
=0.48×100+0.48×0.1,
=48+0.048,
=48.048.
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