Question

Решите уравнение : 1) 8(x-1,4)=0,56 2) (4,6-x)×19=4,18 3) (51,32+ x)×0,12=72 4) 17,28: (56- x)=36

Answer 1

1) 8×(x-1,4)=0,56;
8x-11,2=0,56;
8x=0,56+11,2;
8x=11,76;
x=$\frac{11,76}{8}$=1,47.
ответ: 1,47.

2) (4,6-x)×19=4,18;
87,4-19x=4,18;
-19x=4,18-87,4;
-19x=-83,22;
x=$\frac{-83,22}{-19}$=4,38.
ответ: 4,38.

3)(51,32+x)×0,12=72;
51,32+х= $\frac{72}{0,12}$;
x+51,32=600;
x = 548,68.
ответ: 548,68.

4) $\frac{17,28}{(56-x)}$= 36;
17,28=36×(56-x);
 $\frac{17,28}{36}$=56-x;
56-x=0,48;
-x=0,48-56;
-x=-55,52;
x=55,52.
ответ: 55,52.