1. 3 (8+b) = (3•8)+(8•b) = 24+8b
Ответ: 24+8b
2. 8 (x-7) = (8x)-(8•7) = 8x-56
Ответ: 8х-56
1)9/5=6,3x/7
9/35=6,3x/35
9=6,3x
x=6,3:9
x=0,7
2)3,4/9=17x/4,5
3,4/45=17x/45
3,4=17x
x=17:3,4
x=5
3)1,5x/4=9/8
1,5x/32=9/32
1,5x=9
x=9:1,5
x=6
у'=5(3х^3-1)^4×(9х^2)=45х^2(3х^3-1)^4
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