问题 解答题
选择合适的方法计算
4.96-(1.3+2.96)5600÷25÷81
3
4
÷
3
7
-
1
4
×2
1
3
4
11
×
3
5
+
8
11
×
4
5
5
8
=x:
3
5
2x-3.57+1.43=10.
答案

(1)4.96-(1.3+2.96),

=4.96-1.3-2.96,

=4.96-2.96-1.3,

=2-1.3,

=0.7;

(2)5600÷25÷8,

=5600÷(25×8),

=5600÷200,

=28;

(3)1

3
4
÷
3
7
-
1
4
×2
1
3

=1

3
4
×
7
3
-
1
4
×
7
3

=(1

3
4
-
1
4
)×
7
3

=

3
2
×
7
3

=

7
2

(4)

4
11
×
3
5
+
8
11
×
4
5

=

3
11
×
4
5
+
8
11
×
4
5

=(

3
11
+
8
11
)×
4
5

=1×

4
5

=

4
5

(5)

5
8
=x:
3
5

3
5
=
5
8

3
5
×
3
5
=
5
8
×
3
5

x=

3
8

(6)2x-3.57+1.43=10,

2x-2.14=10,

2x-2.14+2.14=10+2.14,

2x=12.14,

2x÷2=12.14÷2,

x=6.07.

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