计算下面各题,能简算的要简算:(512+13)×12+59×0.75+34×49(27+40%)×76-1569.4-5.185÷1
计算下面各题,能简算的要简算:(512+13)×12+59×0.75+34×49(27+40%)×76-1569.4-5.185÷1.7-13.9×0.5....
计算下面各题,能简算的要简算:(512+13)×12+59×0.75+34×49(27+40%)×76-1569.4-5.185÷1.7-13.9×0.5.
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(1)(
+
)×12+
×0.75+
×
,
=
×12+
×12+
×0.75+0.75×
,
=5+4+(
+
)×0.75,
=9+0.75,
=9.75;
(2)(
+40%)×
-
,
=(
+
)×
-
,
=
×
+
×
-
,
=
+
-
,
=
;
(3)69.4-5.185÷1.7-13.9×0.5,
=69.4-3.05-6.95,
=69.4-(3.05+6.95),
=69.4-10,
=59.4.
5 |
12 |
1 |
3 |
5 |
9 |
3 |
4 |
4 |
9 |
=
5 |
12 |
1 |
3 |
5 |
9 |
4 |
9 |
=5+4+(
5 |
9 |
4 |
9 |
=9+0.75,
=9.75;
(2)(
2 |
7 |
7 |
6 |
1 |
5 |
=(
2 |
7 |
2 |
5 |
7 |
6 |
1 |
5 |
=
2 |
7 |
7 |
6 |
2 |
5 |
7 |
6 |
1 |
5 |
=
1 |
3 |
7 |
15 |
1 |
5 |
=
3 |
5 |
(3)69.4-5.185÷1.7-13.9×0.5,
=69.4-3.05-6.95,
=69.4-(3.05+6.95),
=69.4-10,
=59.4.
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