Вычислите: а) 2 1/2-3,4(12)-4/3+1/3*(1/2+0,5-3 - вопрос №735755321234124313120531205023133 от kristinkadulesova 24.05.2020 01:53

Question

Математика: Вычислите: а) 2 1/2-3,4(12)-4/3+1/3*(1/2+0,5-3 1/2) б) (0,(5)*0,(2)): (3 1/3: 33//5*1 1/3): 4/3

kristinkadulesova · Answer

А). 2 1/2-3,4(12)-4/3+1/3*(1/2+0,5-3 1/2)= 5/2-34/10*12-4/3+1/3(1/2+1/2-7/2)=
5/2-408/10-4/3+1/3(-5/2)=25/10-408/10-8/6-5/6=-433/10-13/6=-2165/30-65/30=
2230/30= -74 1/3≈-74,33
б). (0,(5)*0,(2)):(3 1/3:33/25)-(2/5*1 1/3):4/3=0,1:(10/3*25/33)-(2/5*4/3)*3/4=
1/10*99/250-2/5=99/2500-1000/2500= -901/2500 =-0,3604