Объяснение:
1) (d−9)⋅(d+3)−(d+6)⋅(d−15)=
= (d²+3d-9d-27)-(d²-15d+6d-90)=
= d²+3d-9d-27-d²+15d-6d+90=
= 3d+63 (d² и -d² сократились ) при d = -0.12
3* (-0.12)+63= -0.36+63=62.64
2) (p²−p+2)⋅(19p²+p−2)=
= 19p²*²+p³-2p²-19p³-p²+2p+38p²+2p-4=
= 19p²*²+p³+35p²-19p³+4p-4=
= 19p4-18p³+35p²+4p-4
Объяснение:
1) (d−9)⋅(d+3)−(d+6)⋅(d−15)=
= (d²+3d-9d-27)-(d²-15d+6d-90)=
= d²+3d-9d-27-d²+15d-6d+90=
= 3d+63 (d² и -d² сократились ) при d = -0.12
3* (-0.12)+63= -0.36+63=62.64
2) (p²−p+2)⋅(19p²+p−2)=
= 19p²*²+p³-2p²-19p³-p²+2p+38p²+2p-4=
= 19p²*²+p³+35p²-19p³+4p-4=
= 19p4-18p³+35p²+4p-4