87658+68763+18764=. 986409+5876+5432 =. 6786+46896+41089=. 60999+45398+10342 247*27. 239*454 460598:782 144560:694

1. 175.185

2. 997.717

3. 94.771

4. 116.739

5. 6.669

6. 108506

7. 589

8. 208,299711816

х/14=30 , х=30*14, х=420;

80/у=5, у=80/5, у=16;

м/28=36, м=36*28, м=1008;

513/п=19, п=513/19, п=27;

(а+3 4/7)-1 2/7=4 3/7,(а+25/7)=31/7+9/7, а=40/7-25/7, а=15/7, а=2 1/7;

2 19/23-(5/23+в)=1 6/23, 5/23+в=65/23-29/23,в=36/23-5/23,в=31/23? d=1 8/23;

(с-2 3/11)+5 1/11=7,(с-2 3/11)=7-5 1/11,с=1 10/11+2 3/11,с=4 2/11;

3 4/9+(8-д)=6 5/9, 8-д=6 5/9-3 4/9, д=8-3 1/9,д=4 8/9.

23/50- 5/50=18/50=9/25 во второй час

23/50+18/50=41/50