题目内容
下面各题怎样简便就怎样算.
70×(
|
| 6.4÷50-5.9×
| ||||||||||||||||
101×
| (
| [
|
(1)70×(
+
-
),
=70×
+70×
-70×
,
=30+28-8,
=58-8,
=50;
(2)
×
+
×
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
;
(3)6.4÷50-5.9×
,
=6.4×
-5.9×
,
=(6.4-5.9)×
,
=0.5×
,
=
;
(4)101×
-
×21,
=(101-21)×
,
=80×
,
=16;
(5)(
+1.6×
)×0.25,
=(0.6+0.8)×0.25,
=(1+0.4)×0.25,
=1×0.25+0.4×0.25,
=0.25+0.1,
=0.35;
(6)[
-(0.5+
×
)]÷
,
=[
-(0.5+0.2)]÷
,
=[
-0.7]÷
,
=0÷
,
=0.
| 3 |
| 7 |
| 2 |
| 5 |
| 4 |
| 35 |
=70×
| 3 |
| 7 |
| 2 |
| 5 |
| 4 |
| 35 |
=30+28-8,
=58-8,
=50;
(2)
| 7 |
| 11 |
| 8 |
| 23 |
| 7 |
| 23 |
| 3 |
| 11 |
=
| 7 |
| 11 |
| 8 |
| 23 |
| 3 |
| 23 |
| 7 |
| 11 |
=
| 7 |
| 11 |
| 8 |
| 23 |
| 3 |
| 23 |
=
| 7 |
| 11 |
| 11 |
| 23 |
=
| 7 |
| 23 |
(3)6.4÷50-5.9×
| 1 |
| 50 |
=6.4×
| 1 |
| 50 |
| 1 |
| 50 |
=(6.4-5.9)×
| 1 |
| 50 |
=0.5×
| 1 |
| 50 |
=
| 1 |
| 100 |
(4)101×
| 1 |
| 5 |
| 1 |
| 5 |
=(101-21)×
| 1 |
| 5 |
=80×
| 1 |
| 5 |
=16;
(5)(
| 3 |
| 5 |
| 1 |
| 2 |
=(0.6+0.8)×0.25,
=(1+0.4)×0.25,
=1×0.25+0.4×0.25,
=0.25+0.1,
=0.35;
(6)[
| 7 |
| 10 |
| 2 |
| 5 |
| 1 |
| 2 |
| 16 |
| 7 |
=[
| 7 |
| 10 |
| 16 |
| 7 |
=[
| 7 |
| 10 |
| 16 |
| 7 |
=0÷
| 16 |
| 7 |
=0.
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