<span>2/10</span> = (<span>2·13)/(10·13</span> )= <span>26/<span>130</span></span>
1)2*8,5*6,2+2*0,4*6,2+2*0,4*8,5=
=105,4+4,96+6,8=
=117,16(м2)
2)2*0,204*0,22+2*0,05*0,22+2*0,05*0,204=
=0,08976+0,022+0,0204=
=0,13216(м2)