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13) m(1-1/2+2/3-1/4)=m(12/12-6/12+8/12-3/12)=m(11/12)
15) p(2-7)+q(3/4+3/2)= --5p+q(3/4+6/4)= --5p+9/4q
17) m(0.2+1.07-m)+n(0.02-1.03-1)=0.27m-2.01n
19) a(1.17-2.15-3.25+4.141)= --0.089a
21) m²n(1/5-3/2+3/10)+mn(-2/3-8/3)=m²n(2/10-15/10+3/10)+mn(-10/3)
=m²n(-10/10)--10/3mn=m²n--10/3mn=mn(mn--10/3)
23) u²(1-2)+uv(1+3)+v²((1-1)= --u²+4uv (1-1=0)
25) a(0.117+3.04)+b(-0.35-2.25-1.1)=3.157a-3.7b
27) pt(1/6+2/6+1/6)+p(-2/5-3/5)+t(-3/4+7/4)=4/6pt--p+t (observe que las fracciones se hacen 1 al realizarlas).
29) a²b(3/4-1)+ab²(-2/3-3+1/2)=a²b(3/4-4/4)+ab²(-4/6-18/6+3/6)
=--1/4a²b--19/6ab²
ESPERO NO HABERME EQUIVOCADO. DALE DE IGUAL MODO UNA REVISADA Y SUERTE. BUENAS NOTAS