230×56+23×340
=230×(56+34)
=230×90
=20700
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230×56+23×340
=230×56+230×34
=230×(56+34)
=230×90
=20700
45×56+23×72=90×28+23×8×9=2520+184×(10-1)=2520+1840-184=2520+1656=4176
如图
230*56+23*340
=230*56+23*10*34
=230*56+230*34
=230*(56+34)
=230*90
=20700