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能简算的要简算(1)3.2×1.25×0.25(2)3150×101-3150(3)(78-516)×(59+23)

题目详情


31
50
×101-
31
50
    
(3)(
7
8
-
5
16
)×(
5
9
+
2
3
31
50
31315050
31
50
    
(3)(
7
8
-
5
16
)×(
5
9
+
2
3
31
50
31315050
7
8
-
5
16
)×(
5
9
+
2
3
7
8
7788
5
16
)×(
5
9
+
2
3
5
16
551616
5
9
+
2
3
5
9
5599
2
3
2
3
2233
▼优质解答
答案和解析
(1)3.2×1.25×0.25,
=0.8×4×1.25×0.25,
=(0.8×1.25)×(4×0.25),
=1×1,
=1;

(2)
31
50
×101-
31
50

=
31
50
×(101-1),
=
31
50
×100,
=62;


(3)(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
31
50
313131505050×101-
31
50

=
31
50
×(101-1),
=
31
50
×100,
=62;


(3)(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
31
50
313131505050,
=
31
50
×(101-1),
=
31
50
×100,
=62;


(3)(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
31
50
313131505050×(101-1),
=
31
50
×100,
=62;


(3)(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
31
50
313131505050×100,
=62;


(3)(
7
8
-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
7
8
777888-
5
16
)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
16
555161616)×(
5
9
+
2
3
),
=
9
16
×
11
9

=
11
16
5
9
555999+
2
3
),
=
9
16
×
11
9

=
11
16
2
3
222333),
=
9
16
×
11
9

=
11
16
9
16
999161616×
11
9

=
11
16
11
9
111111999,
=
11
16
11
16
111111161616.