31.14. 1) (0,2a - 1,3b)(0,2a +1,3b); 2) (0,1x3 + 2,52)(0,1x3 – 2,52); 3) (as – b)(a + b2);
4) (x4 + y)(x4 – yº);
5) (72 – 3y)(7t2 + 3y);
6) (4a2 + 9c4)(4a2 – 9c4).​

yellowmellow    3   27.01.2021 11:46    0