题目内容
脱式计算.
4.82-5.2÷0.8×0.6 |
|
0.8×[1÷(3.2-2.95)]. |
分析:(1)先算除法,再算乘法,最后算减法,
(2)先算小括号里的减法,再算中括号里的除法,最后算括号外的除法,
(3)先算小括号里的减法,再算中括号里的除法,最后算括号外的乘法.
(2)先算小括号里的减法,再算中括号里的除法,最后算括号外的除法,
(3)先算小括号里的减法,再算中括号里的除法,最后算括号外的乘法.
解答:解:(1)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)
÷[1÷(
-
)],
=
÷[1÷
],
=
÷
,
=
;
(3)0.8×[1÷(3.2-2.95)],
=0.8×[1÷0.25],
=0.8×4,
=3.2.
=4.82-6.5×0.6,
=4.82-3.9,
=0.92;
(2)
5 |
7 |
2 |
3 |
1 |
5 |
=
5 |
7 |
7 |
15 |
=
5 |
7 |
15 |
7 |
=
1 |
3 |
(3)0.8×[1÷(3.2-2.95)],
=0.8×[1÷0.25],
=0.8×4,
=3.2.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,根据运算顺序逐步求解即可.
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