-12(0)(4)+7(0.4)(2.5)+8(86)(4)+3(0.4)(2.5)+4(86)(4)= 0 + 7(1) + 8(86)(4) + 3(1) + 4(86)(4)= 0 + 7 + 2752 + 3 + 1376= 4138
Итак, -12ab + 7cd + 8ab + 3cd + 4ab при a=0,86; b=4,2; c=0.4; d=2.5 равно 4138.
-12(0)(4)+7(0.4)(2.5)+8(86)(4)+3(0.4)(2.5)+4(86)(4)
= 0 + 7(1) + 8(86)(4) + 3(1) + 4(86)(4)
= 0 + 7 + 2752 + 3 + 1376
= 4138
Итак, -12ab + 7cd + 8ab + 3cd + 4ab при a=0,86; b=4,2; c=0.4; d=2.5 равно 4138.