97+52+303 等于多少,请写过程,谢谢

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97+52+303 等于多少,请写过程,谢谢

97+52+303
=(97+303) +52
=400+52
=452

97+52+303
=97+52+300+3
=97+3+52+300
=100+300+52
=400+52
=452

97+52+303
=97+303+52
=400+52
=452

97+52+303
=97+303+52
=97+3+300+52
=100+300+52
=452