1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = =

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/04/27 21:56:47

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
再问：我问问你，7×8得多少？我看你得好好背背乘法口诀了把.
再答：呃..sorry.. 42×125 =5.25x(8x125)=5.25x1000=5250

1.怎样简便就怎样算：42×125 473+79-63 5×999+5+99×7+7+3×9+3+9 = = = = = 怎样算简便就怎样算；7/9除以11/5+2/9乘以5/11= 怎样算简便就怎样算；8/13除以7+1/7乘以6/13= 怎样简便就怎样算 9分之7十7分之3十7分之4 63/（9+7）=?怎样简便运算 1999×99+1999怎样简便就怎样算（80%-2分之1×5分之4）÷3分之2怎样简便就怎样算 1+2+3+4+5+6+7+8+9……+20=几怎样算简便. (4/9+5)×18=()?怎样简便运算（怎样简便就怎样算）3.7*0.32+3.2*0.63= 解方程要公式X/0.8=3 X+1.37=6.1 7X=17.5 X-4.8=12 怎样简便就怎样算也要公式1.8/0. 计算下面各题,怎样简便就怎样算.0.072×87.5＋8.75×0.28 7.5÷2.5÷0.4 7/8÷9×3/5÷3 （怎样简便就怎样计算）2.3×85+23×1.5=（2分之1+3分之1）÷5分之3-18分之17=