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用简便方法计算:①7÷0.25②69×523③1950×7+5750④(13+12-136)×36.

题目详情
用简便方法计算:
①7÷0.25          
②69×
5
23

19
50
×7+
57
50

④(
1
3
+
1
2
-
1
36
)×36.


5
23

19
50
×7+
57
50

④(
1
3
+
1
2
-
1
36
)×36.
5
23
552323
19
50
×7+
57
50

④(
1
3
+
1
2
-
1
36
)×36.
19
50
19195050
57
50

④(
1
3
+
1
2
-
1
36
)×36.
57
50
57575050
1
3
+
1
2
-
1
36
)×36.
1
3
1133
1
2
-
1
36
)×36.
1
2
1122
1
36
)×36.
1
36
113636
▼优质解答
答案和解析
①7÷0.25,
=(7×4)÷(0.25×4),
=28÷1,
=28;

②69×
5
23

=15;

19
50
×7+
57
50

=
19
50
×7+
19
50
×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
5
23
555232323,
=15;

19
50
×7+
57
50

=
19
50
×7+
19
50
×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
19
50
191919505050×7+
57
50

=
19
50
×7+
19
50
×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
57
50
575757505050,
=
19
50
×7+
19
50
×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
19
50
191919505050×7+
19
50
×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
+
19
50
191919505050×3,
=
19
50
×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
19
50
191919505050×(7+3),
=
19
50
×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
19
50
191919505050×10,
=3
4
5


④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
4
5
444555;

④(
1
3
+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
1
3
111333+
1
2
-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
1
2
111222-
1
36
)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
1
36
111363636)×36,
=
1
3
×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
1
3
111333×36+
1
2
×36
1
36
×36,
=12+18-1,
=29.
1
2
111222×36
1
36
×36,
=12+18-1,
=29.
1
36
111363636×36,
=12+18-1,
=29.