五年级计算训练（五）7.2+2.8二12X2.5 =2.63+0.37 =0.960.3 =1.5-45=2.5 X 0.4=1.4X2.5 =3.5 X 0.2二0.724-0.9=1-0.01 =0.20.01=4.8 + 2 =0.25x40=6.5-5.6=1.25x0.8=、基础练习:(1.5+0.25) X41.25X0.8X0.5二、能简算要简算:25-4.20.132054-0.45.6+5.6X94X(1.5+0.25)、5.8减去2个0.9,差是（4.6乘0.5的积,再除以0.5,商是（1.05的4倍,再加上2.8,和是（