Bài tập 3 trang 57 toán lớp 4 tập 2 Cánh diều:Tính:a) $5+\frac{3}{2}$$\frac{3}{4}...

b) $1-\frac{1}{2}$$5-\frac{7}{3}$$\frac{11}{2}-3 = 1 - \frac{1}{2} - 5 - \frac{7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{15}{3} - \frac{7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{5}{1} - \frac{7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - 5 - \frac{7}{3} - \frac{11}{2} - 3 = 1 - 0.5 - 5 - \frac{7}{3} - 5.5 - 3 = 0.5 - 5 - 2.33 - 3 = -7.83

a) $5+\frac{3}{2}$$\frac{3}{4} +2$$\frac{8}{9}+3 = 5 + \frac{3}{2} + \frac{3}{4} + 2 + \frac{8}{9} + 3 = 5 + \frac{3*2}{2*2} + \frac{3}{4} + 2 + \frac{8}{9} + 3 = 5 + \frac{6}{4} + \frac{3}{4} + 2 + \frac{8}{9} + 3 = 5 + \frac{9}{4} + 2 + \frac{8}{9} + 3 = \frac{20}{4} + 2 + \frac{8}{9} + 3 = \frac{20}{4} + \frac{18}{9} + 3 = \frac{20}{4} + 2 + 3 = 5 + 2 + 3 = 10$

b) $1-\frac{1}{2}$$5-\frac{7}{3}$$\frac{11}{2}-3 = 1 - \frac{1}{2} - 5 - \frac{7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{15}{3} - \frac{7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{15+7}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{22}{3} - \frac{11}{2} - 3 = 1 - \frac{1}{2} - \frac{44}{6} - \frac{33}{6} - \frac{33}{6} = 1 - \frac{1+44+33+33}{6} = 1 - \frac{111}{6} = 1 - 18\frac{3}{6} = 1 - 18 - \frac{1}{2} = -17\frac{1}{2}$

a) $5+3$$\frac{3}{4}+2$$\frac{8}{9}+3 = 5 + \frac{3}{4} + 2 + \frac{8}{9} + 3 = 5 + \frac{9}{4} + 2 + \frac{8}{9} + 3 = \frac{20}{4} + \frac{9}{4} + \frac{8}{9} = \frac{20+9+8*4}{4*9} = \frac{61}{36}$