X²+x√10-25-(x²-25)=x²+x√10-25-x²+25=x√10
При х=√40 √40√10=√40*10=√400=20
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1+8(3Х +7)=9
8(3Х+7)=9-1
<span>1+8(3х+7)=9
</span><span>1+8(3х+7)=9
</span><span>8(3х+7)=9 -1 </span><span>8(3Х+7)=8
</span><span>3Х+7=8:8
</span><span>3Х+7=1
</span>3Х=1-7
3Х=-6
Х=-6/3
X= -2
<u>5⁻⁶ * 5⁻⁶ </u>= 5⁻⁶⁻⁶⁺¹⁰ = 5⁻²= <u> 1 </u>= 0.04
5⁻¹⁰ 25