Распишите подробно,пожалуйста)
1. (b-2) (4b-5) - 4b(b-2)
2. y²-9x² ÷ 18x²+6xy
3. 2x-5/4 - 6x+1/8 = 2
1. (b-2) (4b-5) - 4b(b-2)
2. y²-9x² ÷ 18x²+6xy
3. 2x-5/4 - 6x+1/8 = 2
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Answers & Comments
Verified answer
1.(b-2)(4b-5)-4b(b-2)=4b^2-5b-8b+10-4b^2+8b= -5b+10= -5(b+2)
2.
(у^2-9х^2) / (18х^2+6ху)=((у+3х)(у-3х)) / (6х(3х+у)) = (у-3х)/6х
или так(если 9х:18х)
у^2-1/2+6ху
3.
2х-5/4-6х+1/8=2
-4х=2-1/8+1 2/8
-4х=3 1/8
х= - 25/8:4= - 25/8*1/4
х= - 25/32