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Afla termenul necunoscut, astfel încât egalitatile sa fie egale :a) 300+a×6-49:7×5=1001-664. b) (b-432)+34:2×15=1000-398. c) 454+(22:2×5+c)=24×34-48:4×8. d) (d:6+48:4+72:2:6:3)×10=2×100+25×2. e) 32:e+83×4-36:3×5=2×2×7×10. f) 10×7-f+500:100×3×6=5×5×6​