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RomanMiklazhuk
@RomanMiklazhuk
August 2022
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При каких значениях а равны значения выражений?
8а²-7 и 9а²-8
11а-0,5а² и 2,5а²-25а
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Verified answer
1)
8а²-7=9а²-8
9a^2-8a^2=-7+8
a^2=1
a=+-1
2)
11а-0,5а² = 2,5а²-25а
2,5a^2+0,5a^2-11a-25a=0
3a^2-36a=0
3a(a-12)=0
a=0 или a-12=0
a=12
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Answers & Comments
Verified answer
1)8а²-7=9а²-89a^2-8a^2=-7+8
a^2=1
a=+-1
2)11а-0,5а² = 2,5а²-25а
2,5a^2+0,5a^2-11a-25a=0
3a^2-36a=0
3a(a-12)=0
a=0 или a-12=0
a=12