题目内容
计算下面各题.
| 9.8-1.8×0.45 |
|
(
|
(
|
分析:(1)先算乘法,再算减法;
(2)先算除法,再算加法;
(3)先算小括号里面的减法,再算除法;
(4)先算小括号里面的除法,再算小括号里面的减法,最后算乘法.
(2)先算除法,再算加法;
(3)先算小括号里面的减法,再算除法;
(4)先算小括号里面的除法,再算小括号里面的减法,最后算乘法.
解答:解:
(1)9.8-1.8×0.45,
=9.8-0.81,
=8.99;
(2)
+
÷
,
=
+3,
=3
;
(3)(
-
)÷
,
=
÷
,
=
;
(4)(
÷
-
)×
,
=(
-
)×
,
=
×
,
=
.
(1)9.8-1.8×0.45,
=9.8-0.81,
=8.99;
(2)
| 5 |
| 7 |
| 2 |
| 7 |
| 2 |
| 21 |
=
| 5 |
| 7 |
=3
| 5 |
| 7 |
(3)(
| 5 |
| 6 |
| 1 |
| 8 |
| 5 |
| 12 |
=
| 17 |
| 24 |
| 5 |
| 12 |
=
| 17 |
| 10 |
(4)(
| 8 |
| 9 |
| 4 |
| 15 |
| 5 |
| 9 |
| 6 |
| 25 |
=(
| 10 |
| 3 |
| 5 |
| 9 |
| 6 |
| 25 |
=
| 25 |
| 9 |
| 6 |
| 25 |
=
| 2 |
| 3 |
点评:四则运算,先弄清运算顺序,然后再进一步计算.
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