题目内容
请用简便方法进行计算. 0.78×101 |
1.96×99 |
36.4×4.6+36.4×5.4 | 100.1×101-100.1 |
分析:(1)可将101拆分为100+1后,根据乘法分配律计算;
(2)可将99变为100-1后,根据乘法分配律计算;
(3)(4)可根据乘法分配律计算.
(2)可将99变为100-1后,根据乘法分配律计算;
(3)(4)可根据乘法分配律计算.
解答:解:(1)0.78×101
=0.78×(100+1)
=0.78×100+0.78×1
=78+0.78
=78.78;
(2)1.96×99
=1.96×(100-1)
=1.96×100-1.96×1
=196-1.96
=194.04;
(3)36.4×4.6+36.4×5.4
=(4.6+5.4)×36.4
=10×36.4
=364;
(4)100.1×101-100.1
=100.1×(100-1)
=100.1×100
=10010.
=0.78×(100+1)
=0.78×100+0.78×1
=78+0.78
=78.78;
(2)1.96×99
=1.96×(100-1)
=1.96×100-1.96×1
=196-1.96
=194.04;
(3)36.4×4.6+36.4×5.4
=(4.6+5.4)×36.4
=10×36.4
=364;
(4)100.1×101-100.1
=100.1×(100-1)
=100.1×100
=10010.
点评:完成此类题目要注意分析式中数据的特点,然后运用合适的方法计算.
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