题目内容

递等式计算.
(1)149+587+51
(2)85×0.75+15×75%
(3)4×17×125
(4)(
1
8
+
3
4
)×
1
7
(5)(
1
3
-
1
5
)×45
(6)[1-(
1
2
×
1
6
)]÷
1
3
(1)149+587+51,
=149+51+587,
=200+587,
=787;
(2)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;
(3)4×17×125,
=4×125×17,
=500×17,
=8500;
(4)(
1
8
+
3
4
)×
1
7

=
7
8
×
1
7

=
1
8

(5)(
1
3
-
1
5
)×45,
=
1
3
×45-
1
5
×45,
=15-9,
=6;
(6)[1-(
1
2
×
1
6
)]÷
1
3

=[1-
1
12
]×3,
=1×3-
1
12
×3,
=3-
1
4

=2
3
4
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