Question

вычислите (-4 целых 1/4 +5 целых 2/5)-(3,9*0,1)+1 целая 1/2

Answer 1

$( - 4 \frac{1}{4} + 5 \frac{2}{5} ) - (3.9 \times 0.1) + 1 \frac{1}{2} = ( - \frac{17}{4} + \frac{27}{5} ) - 0.39 + 1 \frac{1}{2} = \frac{ - 85 + 108}{20} - 0.39 + 1 \frac{1}{2} = \frac{23}{20} - 0.39 + \frac{ 3}{2} = \frac{115 - 39}{100} + \frac{3}{2} = \frac{76}{100} + \frac{3}{2} = \frac{19}{25} + \frac{3}{2} = \frac{38 + 75}{50} = \frac{113}{50} = 2 \frac{13}{50} = 2 \frac{26}{100} = 2.26$