数学简便计算:0.25*0.64*4/0.64 9.9*8+7.7*4 9.9*22+3.3*34

问题描述:

数学简便计算:0.25*0.64*4/0.64 9.9*8+7.7*4 9.9*22+3.3*34

数学简便计算:
0.25*0.64*4/0.64
解,得:
==(0.25*4)0.64/0.64
==1

9.9*8+7.7*4
解,得:
==(10-0.1)*8+(8-0.3)*4
==80-0.8+32-1.2
==112-2
==110

9.9*22+3.3*34
解,得:
==(10-0.1)*22+(3+0.3)*34
==220-2.2+102+10.2
==322+8
==330