Question

Математика 3 класс упражнения 7

Answer 1

$450 + a = 920 - 40 \\ 450 + a = 880 \\ a = 880 - 450 \\ a = 430$
$x - 340 = 180 + 20 \\ x - 340 = 200 \\ x = 200 + 340 \\ x = 540$
$y \div 6 = 63 \div 7 \\ y \div 6 = 9 \\ y = 9 \times 6 \\ y = 54$
$8 \times b = 100 - 68 \\ 8 \times b = 32 \\ b = 32 \div 8 \\ b = 4$