五年级简便计算题100道 下面各题怎样简便就怎样算？2.3x6.7-8.21

下面各题怎样简便就怎样算？2.3x6.7-8.21  

下面各题怎样简便就怎样算？2.3x6.7-8.21

2.3x6.7-8.21
=2.3×7-2.3×0.3-8.21
=16.1-0.69-8.21
=16.1-(0.69+8.21)
=16.1-8.9
=7.2

2.3x6.7-8.21的简便方法怎样做

2.3x6.7-8.21
=15.41-8.21
=7.2

下面各题怎样简便就怎样算 336÷[(36一29)X6]

下面各题怎样简便就怎样算
336÷[(36一29)X6]
=336÷[7X6]
=336÷42
=8

下面各题怎样算简便就怎样算0.72÷(0.3x0.2十0.18) 7．75X［2

0.72÷（3/50+9/50）
=0.72*50/12
=3
=7.75*（2除以0.2
=77.5

下面各题，怎么简便就怎样算

578+298=578+300-2=878-2=876
16/2.5=16*4/10=6.4
69*(5/23)=(69/23)*5=3*5=15

下面各题怎样简便就怎样算:755一99=

755-99
=755-100+1
=656

5.7x13.7 6.3x5.7下面各题怎样简便就怎样计算

5.7x13.7 +6.3x5.7
=5.7*（13.7+6.3）
=5.7*20
=114

82×99.9下面各题怎样算简便就算

82x99.9
=82x(100-0.1)
=82x100-82x0.1
=8200-8.2
=8191.8

下面各题，怎样简便就怎样算。238+199+262

＝199+（238+262）
＝199+500
＝699

下面各题，怎样简便就怎样算。374+629-274

374+629-274
=(374-274)+629
=100+629
=729