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4/5 - 3/2=4×2-5×3/5×2=8-15/10=-7/10
7/4-2/1=7×1-4×2/4×1=7-8/4=-1/4
-7/10 + -1 / 4 = -14+ -5 /20 = -19 /20 = -0,95
2) -8/5×7/4=-8×7/5*4=-14/5=-2,8 (para sacar el resultado tienes que simplificar el 8 y el 4 )
3)14/9÷-7/3=[multiplicas cruzado] 42/-63 (simplificar)= 14/-21=-0,6.....
4) (3/5)^4×(3/5)^2+(3/5)^7-(3/5)
81/625×9/25+2187/78125-3/5
(resuelves la multiplicació)
81×9/625×25=725/15625
(ahora resuelves la resta)
2187/78125-3/5=2187×5-78125×3/78125×5=10935-234375/390625=-223440/390625
(ahora resuelves la suma)
725/15625+-223440/390625=3625+-44688/78125 ( el 78125 es el mcm de 15625 y 390625)
=-41063/78125=-0,52535
5) 3 raíz 40/64(factorizacion ) 3×raiz 5/raiz 8 =
3/1×2,236/2,828=6,708/2,828=2,371