6. Вычислите. . . a) (51 q + 4 t 626 kg) : 2 - (3 t 7 q - 15 q 40 kg) · 2 б) 4 m 65 cm + 32 dm 8 cm – 3 · (6 dm + 52 cm) в) 6 h 42 min : 67 + 4 · (357 min – 2 h 15 min)

a) (51q + 4t626kg) : 2 - (3t7q - 15q40kg) · 2Let's simplify this expression step by step:First, divide the first term by 2:(51q + 4t626kg) / 2 = (51q/2) + (4t626kg/2) = 25.5q + 2t313kgNext, distribute the -2 to the second term inside the parentheses:-2(3t7q - 15q40kg) = -6t7q + 30q40kgNow, subtract the second term from the first term:25.5q + 2t313kg - (-6t7q + 30q40kg)Combine like terms:25.5q + 6t7q + 2t313kg - 30q40kgCombine the q terms and the kg terms separately:(25.5q + 6t7q) + (2t313kg - 30q40kg)Simplify each part:31.5q + 2t313kg - 30q40kgb) 4m65cm + 32dm8cm - 3(6dm + 52cm)Let's simplify this expression step by step:First, convert cm to dm in the first term:4m65cm = 4m + 6.5dmNow, we can rewrite the expression with everything in dm:4m + 6.5dm + 32dm8cm - 3(6dm + 52cm)Now, combine like terms:(4m + 6.5dm) + (32dm + 3*(-6dm) - 3*52cm)Simplify each part:4m + 6.5dm + 32dm - 18dm - 156cmCombine like terms again:4m + (6.5dm + 32dm - 18dm) - 156cmSimplify the dm terms in parentheses:4m + 20.5dm - 156cmc) 6h42min : 67 + 4(357min - 2h15min)Let's simplify this expression step by step:First, convert hours to minutes:6h42min = 6*60min + 42min = 402min + 42min = 444minNow, we can rewrite the expression with everything in minutes:444min : 67 + 4(357min - 2h15min)Now, perform the operations inside the parentheses:444min : 67 + 4(357min - 2*60min - 15min)444min : 67 + 4(357min - 120min - 15min)444min : 67 + 4(222min)Now, perform the multiplication inside the second set of parentheses:444min : 67 + 888minNow, perform the division:(444min / 67) + 888minThis is the simplified result.