1. Реши уравнение.
( 3/8а - 1/14) * 2/7 = 4/49.
3/8a-1/14=4/49:2/7=4/49*7/2=2/7
3/8a=1/14+2/7=1/14+4/14=5/14
a=5/14:3/8=5/14*8/3=20/21
2. Реши уравнение.
а) 7/8х - 1 = 3/16х
7/8x-3/16x=1
14/16x-3/16x=1
11/16x=1
x=1:11/16=1*16/11
x=1 5/11
3. Упрости выражение.
- 3/7m + 1/14m - 5/21m.=-18/42m+3/42m-10/42m=-25m/42