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a=9x7- 2x4- 5x10

b=98-[7x7+3x7+5x3]


Răspuns :

A=63-8-50
A=55-50
A=5

B=98-[49+21+15]
B=98-(70+15)
B=98- 85
B=13
b=98-(49+21+15)   
b=98-(70+15)
b=98-85
b=13