19990+3.6×36-2.4×24简便方法,
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19990+3.6×36-2.4×24
简便方法,
19990+3.6×36-2.4×24
=19990+10×(3.6+2.4)×(3.6-2.4)
=19990+10×6×1.2
=19990+72
=20062
19990+3.6×36-2.4×24
简便方法,
19990+3.6×36-2.4×24
=19990+10×(3.6+2.4)×(3.6-2.4)
=19990+10×6×1.2
=19990+72
=20062