题目内容
| 用递等式计算. ①987+104×65-1747 | ②86.4÷3.2-6.4×3.2 | ③
| ||||||||||||||
④17-16.8÷(1.8+7.2×
| ⑤(
| ⑥15÷〔(
|
①987+104×65-1747,
=987+(100+4)×65-1747,
=987+6500+260-1747,
=7747-1747,
=6000;
②86.4÷3.2-6.4×3.2,
=27-20.48,
=6.52;
③
÷7+
×
,
=
×
+
×
,
=
×(
+
),
=
;
④17-16.8÷(1.8+7.2×
),
=17-16.8÷(1.8+0.6),
=17-16.8÷2.4,
=17-7,
=10;
⑤(
+
-
)×6.3,
=6.3×
+6.3×
-6.3×
,
=4.9+1.2-2.7,
=3.4;
⑥15÷〔(
-
)÷
〕-0.5,
=15÷[(
-
)×
]-0.5,
=15÷[
×
-
×
]-0.5,
=15÷[
-
]-0.5,
=15÷2-0.5,
=7.5-0.5,
=7.
=987+(100+4)×65-1747,
=987+6500+260-1747,
=7747-1747,
=6000;
②86.4÷3.2-6.4×3.2,
=27-20.48,
=6.52;
③
| 37 |
| 63 |
| 1 |
| 7 |
| 26 |
| 63 |
=
| 37 |
| 63 |
| 1 |
| 7 |
| 1 |
| 7 |
| 26 |
| 63 |
=
| 1 |
| 7 |
| 37 |
| 63 |
| 26 |
| 63 |
=
| 1 |
| 7 |
④17-16.8÷(1.8+7.2×
| 1 |
| 12 |
=17-16.8÷(1.8+0.6),
=17-16.8÷2.4,
=17-7,
=10;
⑤(
| 7 |
| 9 |
| 4 |
| 21 |
| 3 |
| 7 |
=6.3×
| 7 |
| 9 |
| 4 |
| 21 |
| 3 |
| 7 |
=4.9+1.2-2.7,
=3.4;
⑥15÷〔(
| 5 |
| 7 |
| 1 |
| 2 |
| 3 |
| 28 |
=15÷[(
| 5 |
| 7 |
| 1 |
| 2 |
| 28 |
| 3 |
=15÷[
| 5 |
| 7 |
| 28 |
| 3 |
| 1 |
| 2 |
| 28 |
| 3 |
=15÷[
| 20 |
| 3 |
| 14 |
| 3 |
=15÷2-0.5,
=7.5-0.5,
=7.
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