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b)2*(7dm)^{2} + 4*(7dm * 6dm) = 2 * 49dm^{2} + 4 * 42dm^{2} = 98dm^{2} + 168dm^{2} = 266dm^{2}
c)2*( 9cm*3cm + 12cm*3cm + 9cm * 12cm) = 2*(27cm^{2} + 36cm^{2} + 108cm^{2} ) = 2 * 171^{2} = 108cm^{2}
d)2*( 40dm*2dm + 40dm*8dm + 8dm * 2dm) = 2*(80dm^{2} + 320dm^{2} + 16dm^{2} ) = 2 * 416dm^{2} = 832dm^{2}