题目内容

计算
(1)
4
9
×[
3
4
-(
7
16
-
1
4
)]

(2)
2
15
×4.69+3.21×10
2
15
+7.9÷1
2
13

(3)
7
20
÷[(
5
6
-
1
3
)×3]×
2
3

(4)76×(
1
23
-
1
53
)+23×(
1
53
+
1
76
)-53×(
1
23
-
1
76
)
(1)
4
9
×[
3
4
-(
7
16
-
1
4
)]

=
4
9
×[
3
4
-
7
16
+
1
4
],
=
4
9
×[
3
4
+
1
4
-
7
16
],
=
4
9
×[1-
7
16
],
=
4
9
×
9
16

=
1
4


(2)
2
15
×4.69+3.21×10
2
15
+7.9÷1
2
13

=
2
15
×4.69+3.21×(10+
2
15
)+7.9×
13
15

=
2
15
×4.69+32.1+3.21×
2
15
+7.9×
13
15

=32.1+
1
15
×(2×4.69+2×3.21+7.9×13),
=32.1+
1
15
×[(4.69+3.21)×2+7.9×13],
=32.1+
1
15
×[7.9×2+7.9×13],
=32.1+
1
15
×[(2+13)×7.9],
=32.1+
1
15
×15×7.9,
=32.1+7.9,
=40;

(3)
7
20
÷[(
5
6
-
1
3
)×3]×
2
3

=
7
20
÷[
1
2
×3]×
2
3

=
7
20
÷
3
2
×
2
3

=
7
20
×
2
3
×
2
3

=
7
45


(4)76×(
1
23
-
1
53
)+23×(
1
53
+
1
76
)-53×(
1
23
-
1
76
),
=76×
1
23
-76×
1
53
+23×
1
53
+23×
1
76
-53×
1
23
+53×
1
76

=(76-53)×
1
23
-(76-23)×
1
53
+(23+53)×
1
76

=23×
1
23
-53×
1
53
+76×
1
76

=1-1+1,
=1.
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