Выполни сложение и вычитание по образцу 560 + 30 = 500 + (60 + 30) = 590
730 – 300 = (700 – 300) + 30 = 430
решите это
430 + 50 = 400 + ( + ) =
430 + 500 = ( + ) + =
670 – 40 = 600 + ( - ) =
670 – 400 = ( - ) + =
730 – 300 = (700 – 300) + 30 = 430
решите это
430 + 50 = 400 + ( + ) =
430 + 500 = ( + ) + =
670 – 40 = 600 + ( - ) =
670 – 400 = ( - ) + =
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