34.8x99+34.8的简便运算怎么写
34.8x99+34.8的简便运算怎么写 -
如图，
=17.4*（26+2*86）乘法分配律来简便计算=17.4*98 =17.4*（100-2）二次应用乘法分配律=17.4*100-17.4*2 =1740-34.8 =1705.2
如图，
=17.4*（26+2*86）乘法分配律来简便计算=17.4*98 =17.4*（100-2）二次应用乘法分配律=17.4*100-17.4*2 =1740-34.8 =1705.2
=34.8x(13+86)+8.74 =34.8x99+8.74 =34.8x(100-1)+8.74 =3480-34.8+8.74 =3 453.94