脱式计算(能简算的要简算)( 4 5 + 1 4 )÷ 7 3 + 7 10

2025-05-14 08:56:11
推荐回答(1个)
回答1:

(1)(
4
5
+
1
4
)÷
7
3
+
7
10

=(
16
20
+
5
20
)×
3
7
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
7
10

=
9
20
+
14
20

=
23
20


(2)6×35%+6.5×0.76
=2.1+4.94,
=7.04;

(3)
5
19
×
1
4
+
13
19
×
1
4
+25%×
1
19

=
5
19
×
1
4
+
13
19
×
1
4
+
1
4
×
1
19

=(
5
19
+
13
19
+
1
19
)×
1
4

=1×
1
4

=
1
4


(4)
13
49
×21+13×
28
49

=
21
49
×
13+13×
28
49

=(
21
49
+
28
49
)×13,
=1×13,
=13.