н-10(2н+10) = н-20н-100 = -100-19н = -100-19×(-10) = -100-(-190) = -100+190 = 90
(5м+20)÷(5-м) = (-10×5+20)÷(5-(-10)) = (-50+20)÷15 = -30÷15 = -2
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н-10(2н+10) = н-20н-100 = -100-19н = -100-19×(-10) = -100-(-190) = -100+190 = 90
(5м+20)÷(5-м) = (-10×5+20)÷(5-(-10)) = (-50+20)÷15 = -30÷15 = -2