(4 1/9-а)+8 5/9=9 2/9
5 3/7-(b-2 1/7)=2 4/7
500-400÷(x+43)=495
(270÷y-12)×70=1260
срочно даю 25 балов
Ответы
Ответ:
a=3 целых 4/9
b=5
x=37
y=9
1) (4 1/9 - а) + 8 5/9 = 9 2/9;
4 1/9 - а = 9 2/9 - 8 5/9;
4 1/9 - а = 9 - 8 + 2/9 - 5/9;
4 1/9 - а = 1 - 3/9;
4 1/9 - а = 9/9 - 3/9;
4 1/9 - а = 6/9;
-а = 6/9 - 4 1/9;
а = 4 1/9 - 6/9;
а = 3 + 10/9 - 6/9;
а = 3 4/9.
2) 5 3/7 - (b - 2 1/7) = 2 4/7;
-(b - 2 1/7) = 2 4/7 - 5 3/7;
b - 2 1/7 = 5 3/7 - 2 4/7;
b - 2 1/7 = 5 - 2 + 3/7 - 4/7;
b - 2 1/7 = 3 - 1/7;
b = 3 - 1/7 + 2 + 1/7;
b = 5.
500-400÷(x+43)=495
500 - 400 / (х + 43) = 495,
400 / (х + 43) = 500 - 495,
400 / (х + 43) = 5
х + 43 = 400 / 5,
х + 43 = 80.
х = 80 - 43,
х = 37.
(270 : y - 12) * 70 = 1260;
270 : y – 12 = 1260 / 70;
270 : y – 12 = 18;
270 : y = 18 + 12;
270 : y = 30;
у = 270 / 30;
у = 9;
Ответ:
Пошаговое объяснение:
1)5 3/7-в+2 1/7=2 4/7
5 3/7+2 1/7-2 4/7=в
в=5
2)х+43=400/5
х+43= 80
х=80-43
Х= 37
3)270:у-12=1260:70
270:у=18+12
у=270/30
у=9