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1)найди 4/7 от значения выражения : (40*3+360):(2400:12-6*15+25*2)*(530-380)-170= _______________________________________________________
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(40*3+360):(2400:12-6*15+25*2)*(530-380)-170=280
480 160 150
3 450
4/7 от 280
280:7*4=160
(40*3+360):(2400:12-6*15+25*2)*(530-380)-170= 480 : (200 - 90 +50) * (-20) = 480 / 160*(-20) = -60
4/7 = -60 * 4 / 7 = 233