50 балов за рушения 5.15-5.20. Created by logvinyk1p3msqk. algebra-ru

50 балов за рушения 5.15-5.20...

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m11m

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5.15 B) D= -143 => нет корней

5.16
y=3x-17 (из 1)
2x+3(3x-17)=-7
2x+9x-51=-7
11x=44
x=4
y=3*4-17=12-17=-5
x=4; y=-5

5.17 Г) Минус изменит знак с > на <

5.18
-1-1=3x+2x
5x=-2
x=-2/5

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