1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = = = = = =42×125 473+79-63 5×999+5+99×7+7+3×9+3+9= = == = == = =
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1.怎样简便就怎样算：42×125473+79-635×999+5+99×7+7+3×9+3+9=========42×125473+79-635×999+5+99×7+7+3×9+3+9======
1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = = = = = =42×125 473+79-63 5×999+5+99×7+7+3×9+3+9= = == = == = =
1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = = = = = =
42×125 473+79-63 5×999+5+99×7+7+3×9+3+9
= = =
= = =
= = =
1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = = = = = =42×125 473+79-63 5×999+5+99×7+7+3×9+3+9= = == = == = =
42×125 =7x(8x125)=7x1000=7000
473+79-63 =400+73+79-63=400+79+(73-63)=489
5×999+5+99×7+7+3×9+3+9
=5x(999+1)+7x(99+1)+3x(9+1)+9
=5000+700+30+9
=5739
1、42×125 =125(40+2)=5000+250=5250
2、473+79-63 =463-63+10+79=400+89=489
3、5×999+5+99×7+7+3×9+3+9
=5x(999+1)+7x(99+1)+3x(9+1)+9
=5000+700+30+9
=5739