Объяснение:
метод разбиения на части
S1=(7x-5x)•(2y+3y+2y+4y+2y)=
=2x•13y=26xy
S2=2y•5x=10xy
S3=2y•5x=10xy
S4=2y•5x=10xy
Sфигуры=S1+S2+S3+S4=
=26xy+10xy+10xy+10xy=26xy+30xy=56xy
2.
S1=(3b-2b)•6a=b•6a=6ab
S2=(6a+3a)•2b=9a•2b=18ab
S3=4a•3/2b=6ab
S фигуры=S1+S2+S3=6ab+18ab+6ab=30ab
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Объяснение:
метод разбиения на части
S1=(7x-5x)•(2y+3y+2y+4y+2y)=
=2x•13y=26xy
S2=2y•5x=10xy
S3=2y•5x=10xy
S4=2y•5x=10xy
Sфигуры=S1+S2+S3+S4=
=26xy+10xy+10xy+10xy=26xy+30xy=56xy
2.
S1=(3b-2b)•6a=b•6a=6ab
S2=(6a+3a)•2b=9a•2b=18ab
S3=4a•3/2b=6ab
S фигуры=S1+S2+S3=6ab+18ab+6ab=30ab