题目内容
脱式计算{能简算的要简算} 51÷(7.7-2.48-2.22) |
|
|
分析:(1)小括号里面根据减法的性质进行简算,最后算除法;
(2)根据乘法分配律进行简算;
(3)先算乘法和减法,最后算加法.
(2)根据乘法分配律进行简算;
(3)先算乘法和减法,最后算加法.
解答:解:(1)51÷(7.7-2.48-2.22)
=51÷[7.7-(2.48+2.22)]
=51÷[7.7-4.7]
=51÷3
=17;
(2)
×54+
×46
=
×(54+46)
=
×100
=
;
(3)
×
+(1-
)
=
+
=
.
=51÷[7.7-(2.48+2.22)]
=51÷[7.7-4.7]
=51÷3
=17;
(2)
3 |
8 |
3 |
8 |
=
3 |
8 |
=
3 |
8 |
=
75 |
2 |
(3)
14 |
15 |
3 |
7 |
47 |
60 |
=
2 |
5 |
13 |
60 |
=
37 |
60 |
点评:此题主要考查小数和分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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