( 8а3 - 12а2в+ 6ав2-в3)- ( 8а3+ 12а2в+6ав2+в3)= 8а3- 12а2в+6ав2 -в3-8а 3-12а2в-6ав2-в3= = - 24а2в-2в3
( 8а3 - 12а2в+ 6ав2-в3)- ( 8а3+ 12а2в+6ав2+в3)= 8а3- 12а2в+6ав2 -в3-8а 3-12а2в-6ав2-в3= = - 24а2в-2в3