Решите уровнения (1 - 7/10)x =2 1/4 (3 1/8 + 1 3/4)x = 2 1/6 (1/4+1/5)x = 1 4/5 (2 1/12 - 1 5/6)x = 3//4

( 1 - 7/10 ) * x =2 1/4; ( 10/10 - 7/10 ) * х = 9/4; 3/10 * х = 9/4; х = 9/4 : 3/10; х = 9/4 * 10/3; х = 90/12; х = 15/2. Проверка: ( 1 - 7/10 ) * 15/2 =2 1/4; ( 10/10 - 7/10 ) * 15/2 = 9/4; 3/10 * 15/2 = 9/4; 45/20 = 9/4; 9/4 = 9/4. Решение верно.

( 3 1/8 + 1 3/4 ) * x = 2 1/6; ( 25/8 + 7/4 ) * х = 13/6; ( 25/8 + 14/8 ) * х = 13/6; 39/8 * х = 13/6; х = 13/6 : 39/8; х = 13/6 * 8/39; х = ( 13 * 8 ) / ( 6 * 39 ); х = 104/234; х = 52/117. х = 4/9. Проверка: ( 3 1/8 + 1 3/4 ) * 4/9 = 2 1/6; ( 25/8 + 7/4 ) * 4/9 = 13/6; ( 25/8 + 14/8 ) * 4/9 = 13/6; 39/8 * 4/9 = 13/6; ( 39 * 4 ) / ( 8 * 9 ) = 13/6; 156/72 = 13/6; 13/6 = 13/6. Решение верно.

( 1/4 + 1/5 ) * x = 1 4/5; ( 5/20 + 4/20 ) * х = 9/5; 9/20 * х = 9/5; х = 9/5 : 9/20; х = 9/5 * 20/9; х = 180/45; х = 4. Проверка: ( 1/4 + 1/5 ) * 4 = 1 4/5; ( 5/20 + 4/20 ) * 4 = 9/5; 9/20 * 4 = 9/5; 36/20 = 9/5; 9/5 = 9/5. Решение верно.

( 2 1/12 - 1 5/6 ) * x = 3/4; ( 25/12 - 11/6 ) * х = 3/4; ( 25/12 - 22/12 ) * х = 3/4; 3/12 * х = 3/4; 1/4 * х = 3/4; х = 3/4 : 1/4; х = 3/4 * 4/1; х = 12/4; х = 3. ( 2 1/12 - 1 5/6 ) * 3 = 3/4; ( 25/12 - 11/6 ) * 3 = 3/4; ( 25/12 - 22/12 ) * 3 = 3/4; 3/12 * 3 = 3/4; 9/12 = 3/4; 3/4 = 3/4. Решение верно.