题目内容
用递等式计算. 56.56÷0.7÷0.8 |
(16.8+4.8)÷0.8 |
1.92÷0.12-2.7 | 3.9÷1.3÷5. |
分析:(1)(2)运用除法的性质简算;
(3)先算除法,再算减法;
(4)从左往右依次计算.
(3)先算除法,再算减法;
(4)从左往右依次计算.
解答:解:(1)56.56÷0.7÷0.8
=56.56÷(0.7×0.8)
=56.56÷0.56
=101;
(2)(16.8+4.8)÷0.8
=16.8÷0.8+4.8÷0.8
=21+6
=27;
(3)1.92÷0.12-2.7
=16-2.7
=13.3;
(4)3.9÷1.3÷5
=3÷5
=0.6.
=56.56÷(0.7×0.8)
=56.56÷0.56
=101;
(2)(16.8+4.8)÷0.8
=16.8÷0.8+4.8÷0.8
=21+6
=27;
(3)1.92÷0.12-2.7
=16-2.7
=13.3;
(4)3.9÷1.3÷5
=3÷5
=0.6.
点评:考查了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性质进行简便计算.
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