(2011•济源模拟)巧算下列各题.
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(2011•济源模拟)巧算下列各题.
(
(
4 |
9 |
(1)(
4
9×0.11+0.11×
5
9)×25,
=[0.11×(
4
9+
5
9)]×25,
=0.11×25,
=2.75;
(2)0.375×4
3
8-
3
8+6.625×37.5%,
=
3
8×4
3
8-
3
8+6
5
8×
3
8
=
3
8×(4
3
8-1+6
5
8),
=
3
8×10,
=3
3
4;
(3)24×(
1
4+
1
6-
1
3),
=24×
1
4+
1
6×24-24×
1
3,
=6+4-8,
=2;
(4)98.3-3.32-5.68+10.7,
=(98.3+10.7)-(3.32+5.68),
=109-9,
=100.
4
9×0.11+0.11×
5
9)×25,
=[0.11×(
4
9+
5
9)]×25,
=0.11×25,
=2.75;
(2)0.375×4
3
8-
3
8+6.625×37.5%,
=
3
8×4
3
8-
3
8+6
5
8×
3
8
=
3
8×(4
3
8-1+6
5
8),
=
3
8×10,
=3
3
4;
(3)24×(
1
4+
1
6-
1
3),
=24×
1
4+
1
6×24-24×
1
3,
=6+4-8,
=2;
(4)98.3-3.32-5.68+10.7,
=(98.3+10.7)-(3.32+5.68),
=109-9,
=100.
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