题目内容
能简便的请用简便方法计算 0.25×16.2×4; |
7.09×10.8-0.8×7.09; |
8.44-(5.44+6.3); | 5.27-3.9+0.7. |
分析:(1)根据乘法交换律简便计算;
(2)根据乘法分配律简便计算;
(3)根据连减的简便方法计算即可;
(4)从左往右依次计算即可求解.
(2)根据乘法分配律简便计算;
(3)根据连减的简便方法计算即可;
(4)从左往右依次计算即可求解.
解答:解:(1)0.25×16.2×4
=0.25×4×16.2
=1×16.2
=16.2;
(2)7.09×10.8-0.8×7.09
=7.09×(10.8-0.8)
=7.09×10
=70.9;
(3)8.44-(5.44+6.3)
=8.44-5.44-6.3
=3-6.3
=-3.3;
(4)5.27-3.9+0.7
=1.37+0.7
=2.07.
=0.25×4×16.2
=1×16.2
=16.2;
(2)7.09×10.8-0.8×7.09
=7.09×(10.8-0.8)
=7.09×10
=70.9;
(3)8.44-(5.44+6.3)
=8.44-5.44-6.3
=3-6.3
=-3.3;
(4)5.27-3.9+0.7
=1.37+0.7
=2.07.
点评:考查了运算定律与简便运算,小数四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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