0.45✖️202
=0.45x(200+2)
=0.45x200+0.45x2
=90+0.9
=90.9
0.45&0006;&5039;202 =0.45x(200+2)=0.45x200+0.45x2 =90+0.9 =90.9
0.45×202=0.45×200+0.45×2=90+0.9=90.9
因为202=200+2,所以原式等于0.45×(200+2),运用乘法分配律就是有0.45×200+0.45×2=90.9
0.45×202
=0.45×100+0.45×100+0.45×2
=45+45+0.9
=90.9