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用简便方法计算416+3.9+556+6.1;0.75×45+15×34.

题目详情
用简便方法计算
4
1
6
+3.9+5
5
6
+6.1;           0.75×
4
5
+
1
5
×
3
4

1
6
+3.9+5
5
6
+6.1;           0.75×
4
5
+
1
5
×
3
4
1
6
1166
5
6
+6.1;           0.75×
4
5
+
1
5
×
3
4
5
6
5566
4
5
+
1
5
×
3
4
4
5
4455
1
5
×
3
4
1
5
1155
3
4
3
4
3344
▼优质解答
答案和解析
(1)4
1
6
+3.9+5
5
6
+6.1
=4
1
6
+5
5
6
+(3.9+6.1)
=10+10
=20;

(2)0.75×
4
5
+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
1
6
111666+3.9+5
5
6
+6.1
=4
1
6
+5
5
6
+(3.9+6.1)
=10+10
=20;

(2)0.75×
4
5
+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
5
6
555666+6.1
=4
1
6
+5
5
6
+(3.9+6.1)
=10+10
=20;

(2)0.75×
4
5
+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
1
6
111666+5
5
6
+(3.9+6.1)
=10+10
=20;

(2)0.75×
4
5
+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
5
6
555666+(3.9+6.1)
=10+10
=20;

(2)0.75×
4
5
+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
4
5
444555+
1
5
×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
1
5
111555×
3
4

=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
3
4
333444
=
3
4
×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
3
4
333444×
4
5
+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
4
5
444555+
1
5
×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
1
5
111555×
3
4

=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
3
4
333444
=(
4
5
+
1
5
)×
3
4

=1×
3
4

=
3
4
4
5
444555+
1
5
)×
3
4

=1×
3
4

=
3
4
1
5
111555)×
3
4

=1×
3
4

=
3
4
3
4
333444
=1×
3
4

=
3
4
3
4
333444
=
3
4
3
4
333444.