1)40+30=70;70-10=60; 60+20=80; 80-10=70; 2)50+30=80; 80-20=60; 60плюс 10=70; 70+40=30; 3)70+20=50; 50+30=20; 20плюс50=70; 70плюс10=80; запиши ещё 3 равенства в каждом столбце по тому же правилу.
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