用递等式计算.①987+104×65-1747 ...
用递等式计算.①987+104×65-1747②3763÷7+17×2663③(79+421-37)×6.3④15÷〔(57-12)÷328〕-0.5....
用递等式计算.①987+104×65-1747 ②3763÷7+17×2663③(79+421-37)×6.3 ④15÷〔( 57-12)÷328〕-0.5.
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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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