1989+1988+1987*98
=1987+2+1987+1+1987*98
=1987*(1+1+98)+1+2
=1987*100+3
=198700+3
=198703
1989+1988+1987乘98 怎样脱式进行简算
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1989+1988+1987*98
=1987+2+1987+1+1987*98
=1987*(1+1+98)+1+2
=1987*100+3
=198700+3
=198703