Question

найдите значение выражения 1)1 1/2 х 1 1/3 х 1 1/4 х 1 1/5 х 1 1/6 - 1/2; 2) 1 1/4*1 1/5*1 1/6*1 1/7*1 1/8-1/4; 3) 2 1/2*1 2/5*1 2/7*1 2/9* 1 2/11+1/2; 4) 2 1/3*1 4/7*1 4/11*1 4/15*1 4/19-2/3, помогите пожалуйста у меня СОР ​

Answer 1

1) 1/3х + 1/4х - 1/5х = 1(8/15);

20/60х + 15/60х - 12/60х = 1(8/15);

23/60х = 23/15;

х = 23/15 : 23/60;

х = 23/15 * 60/23;

х = 4.

2) 1(8/9)х + 2(2/15) = 4(29/30);

1(8/9) = 4(29/30) - 2(2/15);

1(8/9)х = 2(5/6);

х = 2(5/6) : 1(8/9);

х = 17/6 * 9/17;

х = 1(1/2).

3) 2(1/3) - 1/24х = 13/16;

1/24х = 2(1/3) - 13/16;

1/24х = 1(25/48);

х = 1(25/48) : 1/24;

х = 73/48 : 24/1;

х = 36(1/2).

4) 6(1/6)х - 11/18 = 5/12;

6(1/6)х = 5/12 + 11/18;

6(1/6)х = 5/12 + 11/18;

6(1/6)х = 37/36;

х = 37/36 : 6(1/6);

х = 37/36 * 6/37;

х = 1/6.