1000 - 8= (990 + 10)-8= 990 + (10 - 8) = 3. Вычисли. а) 576 + 4 593 +7 3 + 547 7 + 123 872 +8 986 + - id2016622720220613 от Alyyya 13.06.2022 07:52

Question

Математика: 1000 - 8= (990 + 10)-8= 990 + (10 - 8) = 3. Вычисли. а) 576 + 4 593 +7 3 + 547 7 + 123 872 +8 986 + 4 4 + 806 2 + 288 1000 - 7 790 - 6 800 - 7 900 - 2 780 - 9 900 - 7 300 - 6 500 - 4 6) 567 + 3 439 + 1 560-9 2 + 678 6 + 324 900 - 7 777 + 3 888 + 2 500 - 6 400 - 9 670 - 5 350 - 8 2 столбиком

Alyyya · Accepted Answer

1) 2/3:(-5/7)= 2/3• (-7/5)= -(2•7)/(3•5)= -14/15 2) -3/4:4/7= -3/4• 7/4= -(3•7)/(4•4)= -21/16= -1 5/16 3) -7/15:(-2)= -7/15• (-1/2)= (7•1)/(15•2)= 7/30 4) -3/7-2/7= - (3/7+2/7)= -5/7 5) 2/5-4/5= -(4/5- 2/5)= -2/5 6) -6/11-(-8/11)= -6/11+ 8/11= 8/11-6/11= 2/11 7) 1/5-7/15= (1•3)/(5•3) - 7/15= 3/15-7/15= -(7/15- 3/15)= -4/15 8) -1/2-(-2/3)= -1/2+ 2/3= -(1•3)/(2•3)+ (2•2)/(3•2)= -3/6+ 4/6= 4/6-3/6= 1/6 9) -5/24-(-11/36) = -5/24+ 11/36= -(5•3)/(24•3)+ (11•2)/(36•2)= -15/72+ 22/72 = 22/72-15/72=7/72...

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