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脱式计算,能简便的要用简便方法计算(1)5120÷32+140(2)(13-16+45)×30(3)[1-(12-14)]×23 (4
脱式计算,能简便的要用简便方法计算(1)5120÷32+140(2)(13-16+45)×30(3)[1-(12-14)]×23(4)168.1÷(4.3×2-0.4)...
脱式计算,能简便的要用简便方法计算(1)5120÷32+140(2)(13-16+45)×30(3)[1-(12-14)]×23 (4)168.1÷(4.3×2-0.4)
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(1)5120÷32+140,
=160+140,
=300;
(2)(
-
+
)×30,
=
×30-
×30+
×30,
=10-5+24,
=5+24,
=29;
(3)[1-(
-
)]×
,
=[1-
]×
,
=
×
,
=
;
(4)肢乎168.1÷(宴饥手4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.晌嫌
=160+140,
=300;
(2)(
1 |
3 |
1 |
6 |
4 |
5 |
=
1 |
3 |
1 |
6 |
4 |
5 |
=10-5+24,
=5+24,
=29;
(3)[1-(
1 |
2 |
1 |
4 |
2 |
3 |
=[1-
1 |
4 |
2 |
3 |
=
3 |
4 |
2 |
3 |
=
1 |
2 |
(4)肢乎168.1÷(宴饥手4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5.晌嫌
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