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Determina valoarea de adevar,notand cu A (adevarat)sau cu F(fals): 42:6x7+36:6x8-29=68 ;81:9+49:7+5x9-28=38 ;4x10:5x4-18:2x3+68=70 ;64:8:4x6+6x4:8x7+56:8=40.