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用自己喜欢的方法计算.(1)99×0.79+0.79(2)1115÷78+415×87(3)2012×20102011(4)10.58-(5.58-712)(5)(1-0.05)÷0.19+0.1(6)5.25×[1-(0.45-0.15)].

题目详情
用自己喜欢的方法计算.
(1)99×0.79+0.79          
(2)
11
15
÷
7
8
+
4
15
×
8
7
(3)2012×
2010
2011
       
(4)10.58-(5.58-
7
12
(5)(1-0.05)÷0.19+0.1     (6)5.25×[1-(0.45-0.15)].
▼优质解答
答案和解析
(1)99×0.79+0.79,
=0.79×(99+1),
=0.79×100,
=79;

(2)
11
15
÷
7
8
+
4
15
×
8
7

=
11
15
×
8
7
+
4
15
×
8
7

=(
11
15
+
4
15
)×
8
7

=1×
8
7

=
8
7


(3)2012×
2010
2011

=(2011+1)×
2010
2011

=2011×
2010
2011
+1×
2010
2011

=2010
2010
2011


(4)10.58-(5.58-
7
12
),
=10.58-5.58+
7
12

=5+
7
12

=5
7
12


(5)(1-0.05)÷0.19+0.1,
=0.95÷0.19+0.1,
=5+0.1,
=5.1;

(6)5.25×[1-(0.45-0.15)],
=5.25×[1-0.3],
=5.25×0.7,
=3.675.