Решить системы а) {3x+2y=5 {2x^2+3y=12 б) {x+y=3 {x^2+2xy+2y^2=18…

А) {3x+2y=5 {y=(5-3x) /2 {y=(5-3x) /2 {y=(5-3x) /2 {2x^2+3y=12 {2x^2+3 (5-3x) /2) {2x^2+(15-9x) /2=12 { (4x^2+15-9x) /2=12{y=(5-3x) /2 {4x^2+15-9x{4x^2+15-9x=244x^2+15-9x-24=0; D=81+144=225=15^2; x=(9+15) /8=3. x=(9-15) /8=-0,75{x=3 {x=-0,75{y=(5-3*3) /2=-2 {y=(5-3 (-0,75) /2=11/8 б) {x+y=3 {x=3-y {x=3-y {x=3-y {y=-9 {x^2+2xy+2y^2=18 { (3-y) ^2+2 (3-y)*y+2y^2=18 {9-y=18 {y=-9 {x=12 в) {x-4y=-1 {x=-1+4y {x=-1+4y {x=-1+4y {y=1 {3x-y=8 {3 (-1+4y) -y=8 {-3+11y=8 {y=1 {x=3 г) {x+y=10 {x=10-y {x=10-y {x=10-y {y=3 {x^2-y^2=40 { (10-y) ^2-y^2=40 {-20y=-60 {y=3 {x=7