(1)98+97-96-95+94+93-92-91+90+89-.-4-3+2+1
=[(98-96)+(97-95)]+[(94-92)+(93-91)]+……+[(6-4)+(5-3)]+2+1
=4+4+……+4(共24个4)+2+1
=4*24+3
=99
(2)37*18+27*42
=37*2*9+3*9*42
=9*(37*2+3*42)
=9*(74+126)
=9*200
=1800
(3)999*222+333*334
=333*3*222+333*334
=333*(666+334)
=333*1000
=333000
小学数学求解(1)98+97-96-95+94+93-92-91+90+89-.-4-3+2+1.(2)37*18+27*42.(3)999*222+333*334
小学数学求解(1)98+97-96-95+94+93-92-91+90+89-.-4-3+2+1.(2)37*18+27*42.(3)999*222+333*334
数学人气:997 ℃时间:2020-05-19 20:49:36
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