а) (7(a^2 + 2ab + b^2) / 10) + 11(a^2 - 2ab + b^2) + 20b - 5(a^2 - b^2) - 4b= (7a^2 + 14ab + 7b^2) / 10 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b= (7a^2 + 14ab + 7b^2) / 10 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b= (7a^2 / 10) + (14ab / 10) + (7b^2 / 10) + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b= 0.7a^2 + 1.4ab + 0.7b^2 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b= 0.7a^2 + 11a^2 - 5a^2 + 1.4ab - 22ab + 0b + 0.7b^2 + 11b^2 + 5b^2 + 20b - 4b= 6.2a^2 - 20ab + 17.7b^2 + 16b
б) (11i + 2 / 7i) - (56i + k) / (21ik - k) - 8 / (3k)= 11i + 2 / 7i - (56i + k) / 21ik - k - 8 / 3k= 11i + 2 / 7i - (56i + k) / 21ik - k - 8 / 3k= 11i + 2i / 7i - 56i / 21ik - k / 21ik - 8 / 3k= (11i + 2i) / 7i - (56i + k) / 21ik - k / 21ik - 8 / 3k= 13i / 7i - 56i / 21ik - k / 21ik - 8 / 3k= (13 / 7) - (56 / 21k) - (1 / 21k) - (8 / 3k)= 1.857 - 2.667 - 0.048 - 2.667= -3.525
а) (7(a^2 + 2ab + b^2) / 10) + 11(a^2 - 2ab + b^2) + 20b - 5(a^2 - b^2) - 4b
= (7a^2 + 14ab + 7b^2) / 10 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b
= (7a^2 + 14ab + 7b^2) / 10 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b
= (7a^2 / 10) + (14ab / 10) + (7b^2 / 10) + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b
= 0.7a^2 + 1.4ab + 0.7b^2 + 11a^2 - 22ab + 11b^2 + 20b - 5a^2 + 5b^2 - 4b
= 0.7a^2 + 11a^2 - 5a^2 + 1.4ab - 22ab + 0b + 0.7b^2 + 11b^2 + 5b^2 + 20b - 4b
= 6.2a^2 - 20ab + 17.7b^2 + 16b
б) (11i + 2 / 7i) - (56i + k) / (21ik - k) - 8 / (3k)
= 11i + 2 / 7i - (56i + k) / 21ik - k - 8 / 3k
= 11i + 2 / 7i - (56i + k) / 21ik - k - 8 / 3k
= 11i + 2i / 7i - 56i / 21ik - k / 21ik - 8 / 3k
= (11i + 2i) / 7i - (56i + k) / 21ik - k / 21ik - 8 / 3k
= 13i / 7i - 56i / 21ik - k / 21ik - 8 / 3k
= (13 / 7) - (56 / 21k) - (1 / 21k) - (8 / 3k)
= 1.857 - 2.667 - 0.048 - 2.667
= -3.525