1)-4,81*(-2,3)-(-2,3)*5,19= ( -3/8+2 1/16)*16= -3/8 *(-6,81)+(3,19)*(-3/8)= (-5/12+3/7)*8,4=
2)(x+4)*(x-3)=0 (3/8y-9/16)*(y-0,8)=0
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