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原式=66*72+72-62 =792*6+10 =4572+10 =4582
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67×72-62
=67×(62+10)-62
=67×62+67×10-62
=(67-1)×62+670
=66×62+670
=11×6×62+670
=11×372+670
=(10+1)×372+670
=10×372+372+670
=3720+372+670
=4092+670
=4762
=67×(62+10)-62
=67×62+67×10-62
=(67-1)×62+670
=66×62+670
=11×6×62+670
=11×372+670
=(10+1)×372+670
=10×372+372+670
=3720+372+670
=4092+670
=4762
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67*72-62
=(62+5)*72-62
=61*71+5*72
=60*71+71+360
=4260+71+360
=4691
=(62+5)*72-62
=61*71+5*72
=60*71+71+360
=4260+71+360
=4691
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67×72-62
=67×(62+10)-62
=67×62+67×10-62
=66×62+670
=66×(60+2)+670
=3960+132+670
=4762
=67×(62+10)-62
=67×62+67×10-62
=66×62+670
=66×(60+2)+670
=3960+132+670
=4762
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