题目内容
用简便方法计算. 2.87÷0.25÷0.4 |
0.125×4.63×8 |
5.43×99+5.43 | (5.1+8.7)÷0.3. |
分析:(1)根据除法的性质进行简算;
(2)根据乘法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
(2)根据乘法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
解答:解:(1)2.87÷0.25÷0.4
=2.87÷(0.25×0.4)
=2.87÷0.1
=28.7;
(2)0.125×4.63×8
=0.125×8×4.63
=1×4.63
=4.63;
(3)5.43×99+5.43
=5.43×(99+1)
=5.43×100
=543;
(4)(5.1+8.7)÷0.3
=5.1÷0.3+8.7÷0.3
=17+29
=46.
=2.87÷(0.25×0.4)
=2.87÷0.1
=28.7;
(2)0.125×4.63×8
=0.125×8×4.63
=1×4.63
=4.63;
(3)5.43×99+5.43
=5.43×(99+1)
=5.43×100
=543;
(4)(5.1+8.7)÷0.3
=5.1÷0.3+8.7÷0.3
=17+29
=46.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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