Question

Решить примеры! ( 30 ) 1) (4,9+9,17-14,35)*1/7= 2) (0,81+1,89-137,7)*1/9= 3) 2m(2 степень)-1/2n при m=9 n=44 4) 4x(2 степень)+1/3y при x=7, y=42 5) 3,5(m-n) при m=2,7 n= -9,3

Answer 1

1)0,004
$1)4.9 + 9.17 = 14.07 \\ 2)14.07 - 14.35 = - 0.28$
$- \frac{28}{1000} \times \frac{1}{7} = - \frac{4}{1000} = 0.004$
2)
$0.81 +1.89 = 2.7 \\ 2.7 - 13.77 = - 11.07$
$11 \frac{7}{100} \times \frac{1}{9} = \frac{1107}{100} \times \frac{1}{9} = \\ \frac{123}{100} = 1 \frac{23}{100}$
3)
${2m}^{2} - \frac{1}{2} n = 2 \times ( {9}^{2} ) - \frac{1}{2} \times 44 \\ = 2 \times 81 - 22 = 162 - 22 = 140$
4)
${4x}^{2} + \frac{1}{3} y = 4 \times ({7}^{2} ) + \frac{1}{3} \times 42 = \\ 4 \times 49 + 14 = 196 + 14 = 210$
$5)3.5(2.7 - ( - 9.3) = 3.5 \times 12 \\ = 42$