Ответ:
b1+b2+b3=63
b2=b1*q
b3=b1*q²
b1+7=a1
b2+18=a2; a2= a1+d
b3+2=a3; a3=a1+2d
b1+b1*q²+b1*q³=63
b1+7=a1; b2+18=a1+d; b3+2= a1+2d
b1=a1-7; b2=a1+d-18; b3= a1+2d-2
a1-7+a1+d-18+a1+2d-2=63
3a1+3d-27=63
3a1+3d=90 |:3
a1+d=30
a2=30; b2=a2-18=30-18=12
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Ответ:
b1+b2+b3=63
b2=b1*q
b3=b1*q²
b1+7=a1
b2+18=a2; a2= a1+d
b3+2=a3; a3=a1+2d
b1+b1*q²+b1*q³=63
b1+7=a1; b2+18=a1+d; b3+2= a1+2d
b1=a1-7; b2=a1+d-18; b3= a1+2d-2
a1-7+a1+d-18+a1+2d-2=63
3a1+3d-27=63
3a1+3d=90 |:3
a1+d=30
a2=30; b2=a2-18=30-18=12