数学简算（用乘法分配律、乘法结合律、乘法交换律计算）能用哪个就用那个,能简算简算,不能就脱式计算

1、2.5×0.6－1.8×0.5 =0.5*5*0.6-1.8*0.5=0.5(5*0.6-1.8)=0.5(3-1.8)=0.5(1.2)=0.6
2、3.25×4.76－7.8 =7.67
3、（4＋0.4）×0.25 =（4×0.25 ＋0.4×0.25 ）=1+0.1=1.1
4、12.5×12×8 =12.5*8*12=100*12=1200
5、50×1.13×0.2=50×0.2×1.13=10*1.13=11.3
6、14.7×1.5×2.8 =61.74
7、2.63×0.8＋2.63×0.2 =2.63×(0.8＋0.2)=2.63*1=2.63
8、3.5×1.83－0.83×3.5=3.5×(1.83－0.83)=3.5*1=3.5简算，要过程，要分行的分行1、2.5×0.6－1.8×0.5 =(0.5*5)*0.6-1.8*0.5 =0.5*(5*0.6)-1.8*0.5 =0.5(5*0.6-1.8) =0.5(3-1.8) =0.5(1.2)=0.62、3.25×4.76－7.8 =7.673、（4＋0.4）×0.25 =（4×0.25 ＋0.4×0.25 ）=1+0.1=1.14、12.5×12×8 =12.5*8*12=100*12=12005、50×1.13×0.2=50×0.2×1.13=10*1.13=11.36、14.7×1.5×2.8 =61.747、2.63×0.8＋2.63×0.2=2.63×(0.8＋0.2)=2.63*1=2.638、3.5×1.83－0.83×3.5=3.5×(1.83－0.83)=3.5*1=3.5