5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=
问题描述：
5×99+5= 47×78-376= 56×101= 37×27= 81×37-7×81= 75×99+75= (25+50)×40=
答
5×99+5= 5×(99+1) = 5×100 = 50047×78-376 = 47×(78-8) = 47×70 = 3290 56×101= 56×(100+1) = 5600 + 56 = 565637×27= (32+5)×(32-5) = 32² - 5² = 1024 - 25 = 99981×37-7×81= 81×(37-7) = ...