67:48= 0.452

572:83= 6.891

429: 612 =0.7

67 : 148 = 0,45 ( dư 0,4 )

572 : 83 = 6,89 ( dư 0,13 )

429 : 612 = 0,7 ( dư 0,6 )

X x 326,63 + 245,37 x X = 429

=> X x ( 326,63 + 245,37 ) = 429

=> X x 572 = 429

=> X = 429 : 572

=> X = 0,75

dễ ẹc mà

962:58 = 16 (du 34)

67:148=0 (du 67)

572:83=6 (du 74)

429:612=0 (du 429)

PC mình bị sida nên xài cốc cốc thêm đâu đó hic

962 : 58 = 16,5862068966

67 : 148 = 0,4527027027

572 :83 = 6,89156626506

429 :612 = 0,70098039215

962:58=16,5862068966

67:148=0,4527027027

572:83=6,89156626506

429:612=0,70098039215

a) 57 + 28 = 85

24 + 67 = 91

46 + 39 = 85

b) 83 - 19 = 64

42 - 38 = 4

90 - 76 = 14

\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)                            \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\)                            \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)

\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\)                           \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\)                            \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)

327

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