简便计算题 756-254+135-245
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简便计算题 756-254+135-245
756 - 254 + 135 - 245 = 392
756-254+135-245
=756-255+136-245
=756+134+2-255-245
=(756+134)-(255+245)+2
=890-500+2
=492
简便计算题 756-254+135-245
756 - 254 + 135 - 245 = 392
756-254+135-245
=756-255+136-245
=756+134+2-255-245
=(756+134)-(255+245)+2
=890-500+2
=492