题目内容
计算:[(0.8+
)×24+6.6]÷
-7.6=( )
1 |
5 |
9 |
14 |
A、30 | B、40 | C、50 | D、60 |
分析:先算小括号内的,再算中括号内的乘法,然后算中括号内的加法,最后算括号外的除法和减法.
解答:解:[(0.8+
)×24+6.6]÷
-7.6
=[(0.8+0.2)×24+6.6]÷
-7.6
=[1×24+6.6]÷
-7.6
=30.6÷
-7.6
=30.6×
-7.6
=47.6-7.6
=40.
故选:B.
1 |
5 |
9 |
14 |
=[(0.8+0.2)×24+6.6]÷
9 |
14 |
=[1×24+6.6]÷
9 |
14 |
=30.6÷
9 |
14 |
=30.6×
14 |
9 |
=47.6-7.6
=40.
故选:B.
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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