递等式计算1、3.8*(1.24
1、3.8*(1.24-1.24/2) 2、3.25-0.86-1. 3、12.5*0.78*0.8 4、2.4*102 5、(7.7+1.4)/0.7 6、5.32*7.2+4.68*7.2
1、3.8×(1.24-1.24÷2) =3.8×(1.24-0.62) =(4-0.2)×0.62 =4×0.62-0.2×0.62 =2.48-0.124 =2.356 2、3.25-0.86-1.14 =3.25-(0.86+1.14) =3.25-2 =1.25 3、12.5×0.78×0.8 =12.5×0.8×0.78 =10×0.78 =7.8 4、2.4×102 =2.4×(100+2) =2.4×100+2.4×2 =240+4.8 =244.8 5、(7.7+1.4)÷0.7 =7.7÷0.7+1.4÷0.7 =11+2 =13 6、5.32×7.2+4.68×7.2 =(5.32+4.68)×7.2 =10×7.2 =72。