48*9+42*9+90怎样简便运算?

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48*9+42*9+90怎样简便运算?
48*9+42*9+90怎样简便运算?

48*9+42*9+90怎样简便运算?
48*9+42*9+90
=9*(48+42)+90
=9*90+90
=90*(1+9)
=90*10
=900

48*9+42*9+90
=48*9+42*9+10*9
=(48+42+10)*9
=100*9
=900

48*9+42*9+90
=(48+42)*9+90
=90*9+90
=90*(9+1)
=900

48*9+42*9+90=48*9+42*9+9*10=(48+42+10)*9=100*9