Question

用分解因式进行计算：539²-439×539 二题：57.3×1998-473×199.8 拜托大家啦

Answer 1

539²-439×539
=539x(539-439)
=539x100
=53900

57.3×1998-473×199.8
=(573-473)x199.8
=100x199.8
=19980

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Answer 2

解
539²-439×539
=539×(539-439)
=539×100
=53900

57.3×1998-473×199.8
=57.3×1998-47.3×1998
=1998×(57.3-47.3)
=1998×10
=19980