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用合理的方法计算.(2)20102011×2012 (3)(58+127)×8+1927(4)35×(17+821+23) (5)16×[1÷(35-310)].

编辑:chaxungu时间:2026-04-27 13:18:48分类:小学数学题库

用合理的方法计算.
(1)8(x-2)=2(x+7)
(2)
2010
2011
×2012
(3)(
5
8
+
1
27
)×8+
19
27

(4)
3
5
×(
1
7
+
8
21
+
2
3
)
(5)
1
6
×[1÷(
3
5
-
3
10
)].(1)8(x-2)=2(x+7),
8x-16=2x+14,
8x-16-2x=2x+14-2x,
6x-16=14,
6x-16+16=14+16,
6x=30,
6x÷6=30÷6,
x=5;

(2)
2010
2011
×2012,
=
2010
2011
×(2011+1),
=
2010
2011
×2011+
2010
2011
×1,
=2010+
2010
2011
,
=2010
2010
2011
;

(3)(
5
8
+
1
27
)×8+
19
27
,
=
5
8
×8+
1
27
×8+
19
27
,
=5+
8
27
+
19
27
,
=5+(
8
27
+
19
27
),
=5+1,
=6;

(4)
3
5
×(
1
7
+
8
21
+
2
3
),
=
3
5
×(
11
21
+
2
3
),
=
3
5
×
25
21
,
=
5
7
;

(5)
1
6
×[1÷(
3
5
-
3
10
)],
=
1
6
×[1÷
3
10
],
=
1
6
×
10
3
,
=
5
9
.