小学数学探索某些实物体积的测量方法解答题

用简便方法计算下面各题．
3.8×6.7+3.3×3.8         1.28×0.29﹣0.29×0.28          101×4.8             56×12.5．

53×99．

690﹣258﹣242．

25×29×4．

口算题．
260+80=           102×80=           72+36+28=             630÷90=
125×8=           940÷20=           837﹣123﹣77=        36×74+36×24=
8×12×5=

用简便的方法计算．
5.48+8.73+4.52+1.27                   0.4×1.25×25×8
17.5﹣4.25﹣5.75                      276×÷27.6
9.25×9.9+92.5%                       ×+÷75%

用简便方法计算
25×32                               475+57+43    25×（6×4）125×16
175+201                              451﹣51﹣49．

根据加法、乘法运算定律，在□中填上合适的数
□+571=□+259．

301+718+699+182．

用简便方法计算．
6.45×102                    0.47×0.5×0.8                 0.46×1.9+0.54×1.9
0.027+9.9×0.27              15.8×69.3﹣68.3×15.8         1.25×32×2.5．

怎样简便就怎样计算
63+152+137+148=              102×99=                 645﹣180﹣245=
382×101﹣382=               125×24=                 35×8+35×6﹣4×35=
1280÷16÷4=                 890﹣147﹣53=            32×25×125=

（13+13×2+13）×25．

怎样算简便就怎样算
715+265+335+285                125×（8×4）×5                 125×96
759﹣159﹣63﹣37                301×30                         630÷35．

简便计算
4.65﹣1.37﹣2.63．