题目内容
下面各题怎样简便就怎样计算
①5.02-1.37-2.63
②[
-(
-
)÷
]÷
③
+
+
+
+…++
.
①5.02-1.37-2.63
②[
| 3 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 10 |
③
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 99×100 |
(1)5.02-1.37-2.63,
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
(2)[
-(
-
)÷
]÷
,
=[
-
×
]÷
,
=[
-
]÷
,
=
×
,
=1;
(3)
+
+
+
+…++
,
=(
-
)+(
-
)+(
-
)+(
-
)+…+(
-
),
=1-
,
=
.
=5.02-(1.37+2.63),
=5.02-4,
=1.02;
(2)[
| 3 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 10 |
=[
| 3 |
| 5 |
| 5 |
| 12 |
| 6 |
| 5 |
| 1 |
| 10 |
=[
| 3 |
| 5 |
| 1 |
| 2 |
| 1 |
| 10 |
=
| 1 |
| 10 |
| 10 |
| 1 |
=1;
(3)
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 99×100 |
=(
| 1 |
| 1 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 99 |
| 1 |
| 100 |
=1-
| 1 |
| 100 |
=
| 99 |
| 100 |
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