题目内容
能简算的要简算.
①23×
+57÷
②1.36×2.7+13.6×0.73
③0.25×1.25÷
④(
+
-
)×24
⑤[1-
÷(
+
×
)]÷
⑥2008×
.
①23×
3 |
8 |
8 |
3 |
②1.36×2.7+13.6×0.73
③0.25×1.25÷
1 |
32 |
④(
3 |
8 |
7 |
8 |
2 |
3 |
⑤[1-
7 |
8 |
5 |
6 |
1 |
2 |
1 |
3 |
7 |
12 |
⑥2008×
1 |
2007 |
①23×
+57÷
,
=(23+57)×
,
=80×
,
=30;
②1.36×2.7+13.6×0.73,
=1.36×2.7+1.36×7.3
=1.36×(2.7+7.3),
=1.36×10,
=13.6;
③0.25×1.25÷
,
=0.25×1.25×32,
=(0.25×4)×(1.25×8),
=1×10,
=10;
④(
+
-
)×24,
=
×24+
×24-
×24,
=9+21-16,
=14;
⑤[1-
÷(
+
×
)]÷
,
=[1-
÷1]÷
,
=
÷
,
=
;
⑥2008×
,
=(2007+1)×
,
=2007×
+
,
=1+
,
=1
.
3 |
8 |
8 |
3 |
=(23+57)×
3 |
8 |
=80×
3 |
8 |
=30;
②1.36×2.7+13.6×0.73,
=1.36×2.7+1.36×7.3
=1.36×(2.7+7.3),
=1.36×10,
=13.6;
③0.25×1.25÷
1 |
32 |
=0.25×1.25×32,
=(0.25×4)×(1.25×8),
=1×10,
=10;
④(
3 |
8 |
7 |
8 |
2 |
3 |
=
3 |
8 |
7 |
8 |
2 |
3 |
=9+21-16,
=14;
⑤[1-
7 |
8 |
5 |
6 |
1 |
2 |
1 |
3 |
7 |
12 |
=[1-
7 |
8 |
7 |
12 |
=
1 |
8 |
7 |
12 |
=
3 |
14 |
⑥2008×
1 |
2007 |
=(2007+1)×
1 |
2007 |
=2007×
1 |
2007 |
1 |
2007 |
=1+
1 |
2007 |
=1
1 |
2007 |
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