87*3分之86+83分之86(简便计算)please tell me at once!是87*86分之3+86分之83

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87*3分之86+83分之86(简便计算)please tell me at once!是87*86分之3+86分之83
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87*3分之86+83分之86(简便计算)please tell me at once!是87*86分之3+86分之83
87*3分之86+83分之86(简便计算)
please tell me at once!
是87*86分之3+86分之83

87*3分之86+83分之86(简便计算)please tell me at once!是87*86分之3+86分之83
87*(3/86)+83/86
=(86+1)*(3/86)+83/86
=3+3/86+83/86
=3+(83+3)/86
=3+86/86
=3+1=4