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(2011•平和县模拟)脱式计算:(1)(2.34-3.25×6.4)÷6.5(2)89×[34-(716-14)](3)36×(16﹢19-112)(4)3.25×9.8+0.325×2.

题目详情
(2011•平和县模拟)
脱式计算:
(1)(2.34-3.25×6.4)÷6.5
(2)
8
9
×[
3
4
-(
7
16
-
1
4
)]
(3)36×(
1
6
1
9
-
1
12
(4)3.25×9.8+0.325×2.
▼优质解答
答案和解析
(1)(2.34-3.25×6.4)÷6.5,
=(2.34-20.8)÷6.5,
=-18.46÷6.5,
=-2.84;

(2)
8
9
×[
3
4
−(
7
16
1
4
)],
=
8
9
×[
3
4
7
16
+
1
4
],
=
8
9
×[
3
4
+
1
4
7
16
 ],
=
8
9
×[1−
7
16
],
=
8
9
×
9
16

=
1
2


(3)36×(
1
6
+
1
9
1
12
),
=36×
1
6
+36×
1
9
−36 ×
1
12

=6+4-3,
=7;

(4)3.25×9.8+0.325×2,
=3.25×9.8+3.25×0.2,
=3.25×(9.8+0.2),
=3.25×10,
=32.5.