(1) {х-8у-17=0 {3x+4y-23=0 (2) {8x-9y-21=0 {3x-2y-12=0 - вопрос №557475418170342302892103212015482030 от selihanova 16.10.2021 01:43

Question

Математика: (1) {х-8у-17=0 {3x+4y-23=0 (2) {8x-9y-21=0 {3x-2y-12=0 n1548 (2) {0.3x-0.5y=0 {0.1x+2y=6.5 (4) {0.7x+6y=27.9 {1.5x-2y=-14.5

selihanova · Answer

(1){х-8у-17=0{3x+4y-23=0х=17+8у3(17+8у)+4y-23=051+24у+4у=2328у=23-5128у=-28у=-1х=17+8*(-1)=17-8=9(2){8x-9y-21=0{3x-2y-12=03x-2y-12=03х=12+2ух=(12+2у)/38(12+2у/3)-9y-21=0(96+16у-27у)/3=2196-11у=21*311у=96-6311у=33у=3х=(12+2*3)/3=18/3=6N1548(2) {0.3x-0.5y=0{0.1x+2y=6.50.1x+2y=6.50,1х=6,5-2ух=(6,5-2у)/0,1х=(6,5-2у)*100.3(6,5-2у)*10 -0.5y=03(6,5-2у) -0.5y=019,5-6у-0,5у=06,5у=19,5у=3х=10(6,5-2*3)=10*0,5=5(4){0.7x+6y=27.9{1.5x-2y=-14.51.5x-2y=-14.52у=1,5х+14,5у=(1,5х+14,5)/20.7x+6(1,5х+14,5)/2=27.90.7x+3(1,5х+14,5)=27.90,7x+4,5х+43,5=27,95,2х=27,9-43,55,2х=-15,6х=3у=(1,5*3+14,5)/2=19/2=9,5...