7/8*23=?簡算

7/8*23=?簡算




24*43分之51+51*43分之19=?


24×51/43+51×19/43
=1/43×(24×51+51×19)
=1/43×[51×(24+19)]
=1/43×51×43
=51×1/43×43
=51