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Calculeaza

a. (1+2x5)(x( 2+3x6)

b.(12x25-75):(20x3-5x9)

c.17-(7-3)

d.180-[50-(40-30)]

e.(180-50)-(40-30)

f.(38-8)+10

g.(40+10)+7

h.(60+20)-15

j. 60-(20-15)

e. 60+(20+15)