题目内容
脱式计算
(1)(9.35-5
)÷7×
(2)[(888+
)×1.125-360÷
]÷23%
(1)(9.35-5
3 |
4 |
5 |
18 |
(2)[(888+
8 |
9 |
2 |
3 |
分析:(1)先算小括号里面的减法,再把除法变成乘法,运用乘法交换律简算;
(2)先运用乘法分配律简算,再把888分解成8×111运用乘法结合律简算,再算出中括号里面的除法,然后算中括号里面的减法,最后算括号外的除法.
(2)先运用乘法分配律简算,再把888分解成8×111运用乘法结合律简算,再算出中括号里面的除法,然后算中括号里面的减法,最后算括号外的除法.
解答:解:(1)(9.35-5
)÷7×
,
=3.6÷7×
,
=3.6×
×
,
=1×
,
=
;
(2)[(888+
)×1.125-360÷
]÷23%,
=[888×1.125+
×1.125-360÷
]÷23%,
=[8×1.125×111+
×1.125-360×
]÷23%,
=[9×111+1-540]÷23%,
=[1000-540]÷23%,
=460÷0.23,
=2000.
3 |
4 |
5 |
18 |
=3.6÷7×
5 |
18 |
=3.6×
5 |
18 |
1 |
7 |
=1×
1 |
7 |
=
1 |
7 |
(2)[(888+
8 |
9 |
2 |
3 |
=[888×1.125+
8 |
9 |
2 |
3 |
=[8×1.125×111+
8 |
9 |
3 |
2 |
=[9×111+1-540]÷23%,
=[1000-540]÷23%,
=460÷0.23,
=2000.
点评:此题主要考查分数、整数、小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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