如题所述
第1个回答 2016-10-11
4.5x98
=4.5x(100-2)
=4.5x100-4.5x2
=450-9
=441
3.6x0.25
=0.9x(4x2.5)
=0.9x1
=0.9
7.5x102
=7.5x(100+2)
=7.5x100+7.5x2
=750+15
=765本回答被网友采纳
=4.5x(100-2)
=4.5x100-4.5x2
=450-9
=441
3.6x0.25
=0.9x(4x2.5)
=0.9x1
=0.9
7.5x102
=7.5x(100+2)
=7.5x100+7.5x2
=750+15
=765本回答被网友采纳