例.1.8*73+52*8 例.2.9*96+3*9+9=8*（73+52） =9*（96+3+1）=8*125 =9*100+1000 =9001.54*99+99*45 4.54+99*99+45= == == =2.100*89+89*11+89*89 5.100*89-89*11-89*89= == == =3.8*999*8 6.5*999+5+99*7+7+4*9+4= == == =

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例.1.8*73+52*8 例.2.9*96+3*9+9=8*（73+52） =9*（96+3+1）=8*125 =9*100+1000 =9001.54*99+99*45 4.54+99*99+45= == == =2.100*89+89*11+89*89 5.100*89-89*11-89*89= == == =3.8*999*8 6.5*999+5+99*7+7+4*9+4= == == =
例.1.8*73+52*8 例.2.9*96+3*9+9
=8*（73+52） =9*（96+3+1）
=8*125 =9*100
+1000 =900
1.54*99+99*45 4.54+99*99+45
= =
= =
= =
2.100*89+89*11+89*89 5.100*89-89*11-89*89
= =
= =
= =
3.8*999*8 6.5*999+5+99*7+7+4*9+4
= =
= =
= =

例.1.8*73+52*8 例.2.9*96+3*9+9=8*（73+52） =9*（96+3+1）=8*125 =9*100+1000 =9001.54*99+99*45 4.54+99*99+45= == == =2.100*89+89*11+89*89 5.100*89-89*11-89*89= == == =3.8*999*8 6.5*999+5+99*7+7+4*9+4= == == =
=99*(45+54) =89*(100+11+89) =8*(999+1)
=99*100 =89*200 =8*1000
=9900 =17800 =8000
=99*(54+45) =89*(100-11-89)
=99*100 =89*0
=9900 =0
=5*(999+1)+7*(99+1)+4*(9+1)
=5000+700+40
=5740

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例.1.8*73+52*8 例.2.9*96+3*9+9=8*（73+52） =9*（96+3+1）=8*125 =9*100+1000 =9001.54*99+99*45 4.54+99*99+45= == == =2.100*89+89*11+89*89 5.100*89-89*11-89*89= == == =3.8*999*8 6.5*999+5+99*7+7+4*9+4= == == = 化简比的格式例：1.8： 万有引力,例6,CD例7,AD例8,AD [(2)是化简.例7.例8求值域] 如果3x+1.8=1·8那么x÷2.9=多少 数学例1例2例3 例7和例8,为什么例7,x平方减3x+4大于0横成立 例11 例1 例三 例：急中生智 例2 例3 例2 例二 例：群响毕绝 例1. 例八