475+254+361的简便运算
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475+254+361的简便运算
475+254+361的简便运算
475+254+361的简便运算
475+254+361
=500-20-5+200+50+5 -1 + 300 + 50 +10 +1
=500+200+300+50+50-20+10
=1090
475+254+361
=(450+25)+(250+4)+361
=(450+250)+(25+4+361)
=700+390
=1090