293+720除以45*12 简便

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293+720除以45*12简便293+720除以45*12简便293+720除以45*12简便=293+(80*9)/(5*9)*12=293+80/5*12=293+16*12=293+192=4

293+720除以45*12 简便
293+720除以45*12 简便

293+720除以45*12 简便
=293+(80*9)/(5*9)*12
=293+80/5*12
=293+16*12
=293+192
=485

293+720除以45*12
=293+60÷45
=293+4/3
=294又3分之1

293+720÷45*12
=293+720÷9÷5*12
=293+80÷5*12
=293+16*12
=293+192
=485

原式 =293+9*80/(9*5)*12
=293+16*5/5*12
=293+ 16*12
=485