题目内容
用递等式计算.
①987+104×65-1747
②
÷7+
×
③(
+
-
)×6.3
④15÷〔(
-
)÷
〕-0.5.
①987+104×65-1747
②
| 37 |
| 63 |
| 1 |
| 7 |
| 26 |
| 63 |
③(
| 7 |
| 9 |
| 4 |
| 21 |
| 3 |
| 7 |
④15÷〔(
| 5 |
| 7 |
| 1 |
| 2 |
| 3 |
| 28 |
①987+104×65-1747,
=(1000-13)+(100+4)×65-1747,
=1000-13+6500+260-1747,
=1000-13+6500+200+60-1700-47,
=(1000+6500+200-1700)+(60-13-47),
=6000+0,
=6000;
②
÷7+
×
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
③(
+
-
)×6.3,
=
×6.3+
×6.3-
×6.3,
=4.9+1.2-2.7,
=3.4;
④15÷[(
-
)÷
]-0.5,
=15÷[
×
]-0.5,
=15÷2-0.5,
=7.5-0.5,
=7.
=(1000-13)+(100+4)×65-1747,
=1000-13+6500+260-1747,
=1000-13+6500+200+60-1700-47,
=(1000+6500+200-1700)+(60-13-47),
=6000+0,
=6000;
②
| 37 |
| 63 |
| 1 |
| 7 |
| 26 |
| 63 |
=
| 37 |
| 63 |
| 1 |
| 7 |
| 1 |
| 7 |
| 26 |
| 63 |
=(
| 37 |
| 63 |
| 26 |
| 63 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
③(
| 7 |
| 9 |
| 4 |
| 21 |
| 3 |
| 7 |
=
| 7 |
| 9 |
| 4 |
| 21 |
| 3 |
| 7 |
=4.9+1.2-2.7,
=3.4;
④15÷[(
| 5 |
| 7 |
| 1 |
| 2 |
| 3 |
| 28 |
=15÷[
| 3 |
| 14 |
| 28 |
| 3 |
=15÷2-0.5,
=7.5-0.5,
=7.
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