28×34+72×66用简便方法计算
答案:1 悬赏:70 手机版
解决时间 2021-02-20 08:50
- 提问者网友：不爱我么
- 2021-02-19 16:18
28×34+72×66用简便方法计算
最佳答案
- 五星知识达人网友：鱼芗
- 2021-02-19 17:27
解法1: 28*34+72*66
=(100-72)*34+72*66
=100*34-72*34+72*66
=3400+(66-34)*72
=3400+32*72
=3400+(30+2)*72
=3400+(2160+144)
=3400+2304
=5704
解法2：28*34+72*66
=（28+2）*34+（70+2）*66
=30*34-2*34+70*66+2*66
=1020-68+4620+132
=952+4620+132
=5572+132
=5704
解法3：28*34+72*66
=28*34+72*（34+30+2）
=28*34+72*34+72*30+72*2
=（28+72）*34+2160+144
=3400+2160+144
=5560+144
=5704
=(100-72)*34+72*66
=100*34-72*34+72*66
=3400+(66-34)*72
=3400+32*72
=3400+(30+2)*72
=3400+(2160+144)
=3400+2304
=5704
解法2：28*34+72*66
=（28+2）*34+（70+2）*66
=30*34-2*34+70*66+2*66
=1020-68+4620+132
=952+4620+132
=5572+132
=5704
解法3：28*34+72*66
=28*34+72*（34+30+2）
=28*34+72*34+72*30+72*2
=（28+72）*34+2160+144
=3400+2160+144
=5560+144
=5704
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