题目内容
脱式计算.(能简算的要简算)
28.76-4.37-5.63
58×0.37+0.37×42
8.27-5.84+1.73-2.16
516÷(36×11-353)
解:(1)28.76-4.37-5.63,
=28.76-(4.37+5.63),
=28.76-10,
=18.76;
(2)58×0.37+0.37×42,
=(58+42)×0.37,
=100×0.37,
=37;
(3)8.27-5.84+1.73-2.16,
=8.27+1.73-(5.84+2.16),
=10-8,
=2;
(4)516÷(36×11-353),
=516÷(396-353),
=516÷43,
=12.
分析:(1)运用减法的性质简算;
(2)运用乘法分配律简算;
(3)运用加法交换律与结合律以及减法的性质简算;
(4)先算括号内的乘法,再算括号内的减法,最后算括号外的除法.
点评:考查了整数、小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
=28.76-(4.37+5.63),
=28.76-10,
=18.76;
(2)58×0.37+0.37×42,
=(58+42)×0.37,
=100×0.37,
=37;
(3)8.27-5.84+1.73-2.16,
=8.27+1.73-(5.84+2.16),
=10-8,
=2;
(4)516÷(36×11-353),
=516÷(396-353),
=516÷43,
=12.
分析:(1)运用减法的性质简算;
(2)运用乘法分配律简算;
(3)运用加法交换律与结合律以及减法的性质简算;
(4)先算括号内的乘法,再算括号内的减法,最后算括号外的除法.
点评:考查了整数、小数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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