Ответ:
x²+7x+6=0; x1= -1
x1+x2= -7 x2= -6
x1×x2=6
5x²-7x+2=0
D=49-40=9
x1=(7+3)÷10=1
x2=(7-3)÷10=0.4
x²=7x+18
x²-7x-18=0
x1+x2=7 x1= -2
x1×x2= -18 x2=9
x²+3x-54=0
x1+x2= -3 x1= -9
x1×x2= -54 x2=6
2x²-7x+3=0
D=49-24=25
x1=(7+5)÷4=3
x2=(7-5)÷4=0.5
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Ответ:
x²+7x+6=0; x1= -1
x1+x2= -7 x2= -6
x1×x2=6
5x²-7x+2=0
D=49-40=9
x1=(7+3)÷10=1
x2=(7-3)÷10=0.4
x²=7x+18
x²-7x-18=0
x1+x2=7 x1= -2
x1×x2= -18 x2=9
x²+3x-54=0
x1+x2= -3 x1= -9
x1×x2= -54 x2=6
2x²-7x+3=0
D=49-24=25
x1=(7+5)÷4=3
x2=(7-5)÷4=0.5