12.5×(0.8 + 4)×2.5的简便方法?
12.5×(0.8 + 4)×2.5
=12.5×0.8×2.5+12.5×4×2.5
=25+125
=150
12.5×(0.8 + 4)×2.5
= 12.5×[(0.8 + 4)×2.5]
=12.5x(2+10)
=25+125
=150
12.5*(0.8+4)*2.5
=12.5*(0.8*2.5+4*2.5)
=12.5*(3)
=37.5
有用的话就请采纳吧,谢谢!
解: 12.5x(0.8+4)x2.5
=12.5x(0.8x2.5+4x2.5)
=12.5x(1+10)
=12.5x11
=137.5
12.5×(0.8+4)×2.5
=12.5×2.5×0.8+12.5×2.5×4
=(12.5×0.8)×2.5+12.5×(2.5×4)
=10×2.5+12.5×10
=10×(2.5+12.5)
=10×15
=150