题目内容
(1)36×(
+
-
)
(2)[
-(
×
+
×
)]÷
(3)51×
(用简便方法计算)
(4){1-[
+
÷(
+
)]}×
(5)30
×
(看能否用简便方法计算).
| 5 |
| 9 |
| 3 |
| 4 |
| 11 |
| 8 |
(2)[
| 1 |
| 2 |
| 3 |
| 8 |
| 11 |
| 12 |
| 3 |
| 8 |
| 1 |
| 12 |
| 3 |
| 4 |
(3)51×
| 40 |
| 50 |
(4){1-[
| 1 |
| 5 |
| 7 |
| 10 |
| 1 |
| 2 |
| 3 |
| 8 |
| 1 |
| 2 |
(5)30
| 1 |
| 28 |
| 28 |
| 29 |
(1)36×(
+
-
),
=36×
+36×
-36×
,
=20+27-49.5,
=-2.5;
(2)[
-(
×
+
×
)]÷
,
=[
-
×(
+
)],
=[
-
],
=
;
(3)51×
,
=50×
+1×
,
=40+
,
=40
;
(4){1-[
+
÷(
+
)]}×
,
={1-[
+
÷
]}×
,
={1-[
+
]}×
,
={1-1}×
,
=0×
,
=0;
(5)30
×
,
=29×
+1×
+
×
,
=28+(
+
),
=28+1,
=29.
| 5 |
| 9 |
| 3 |
| 4 |
| 11 |
| 8 |
=36×
| 5 |
| 9 |
| 3 |
| 4 |
| 11 |
| 8 |
=20+27-49.5,
=-2.5;
(2)[
| 1 |
| 2 |
| 3 |
| 8 |
| 11 |
| 12 |
| 3 |
| 8 |
| 1 |
| 12 |
| 3 |
| 4 |
=[
| 1 |
| 2 |
| 3 |
| 8 |
| 11 |
| 12 |
| 1 |
| 12 |
=[
| 1 |
| 2 |
| 3 |
| 8 |
=
| 1 |
| 8 |
(3)51×
| 40 |
| 50 |
=50×
| 40 |
| 50 |
| 40 |
| 50 |
=40+
| 4 |
| 5 |
=40
| 4 |
| 5 |
(4){1-[
| 1 |
| 5 |
| 7 |
| 10 |
| 1 |
| 2 |
| 3 |
| 8 |
| 1 |
| 2 |
={1-[
| 1 |
| 5 |
| 7 |
| 10 |
| 7 |
| 8 |
| 1 |
| 2 |
={1-[
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 2 |
={1-1}×
| 1 |
| 2 |
=0×
| 1 |
| 2 |
=0;
(5)30
| 1 |
| 28 |
| 28 |
| 29 |
=29×
| 28 |
| 29 |
| 28 |
| 29 |
| 1 |
| 28 |
| 28 |
| 29 |
=28+(
| 28 |
| 29 |
| 1 |
| 29 |
=28+1,
=29.
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