( -— 1 ) + ( -— 5 ) + (- 7 7 8)
1 —- (- 1 — ) + ( - 6 —) 5 4 5 (- 0.8) ÷—× 1 (- 2) 2 ( -— 1 ) × ( -—+— 1 1 ) × 0 4 9
7 21÷[(-3) 2÷(-3)] 28- (-18) -7+(-11) (-2) 4-22 (-1) 1147
28+[(-2) 3-(-1]
1 1 1 (—- —) ÷(- —) 6 8 7 16+(-19) -10+(-11) 9 1 (—+ —) ×(-80) 8 2 (-4) 2-52 (-1) 2114 (-5)×(-4) 9-(-19) -2.5-(-11.5) 1 1 (-—) +(-—) 9 7 11+[4-(-20+6)] (-4)3-52 -13+17+(-13)-(-27) 3.3+(-0.2)-(-2.4)+3.4
2 1 1 4 (—+—) +(—+—) 9 8 7 7 9 7 2.8-(-—) +(-5.2) +— 5 5 -(7n-9)
x +5(9-6c)
7x +5(9y+9z) -(6x+y) -6(2n-8c) 1 —(16+4x) +z 2 -3(3a-9bc -3)
1 1 -—(y+z) -—(m+n) 9 5
4(7b+y) +2(n+7q)
-3a -(6a+7) 2(6a + 4) + 6a 2(ab - 8a) +(4a - 9b) 2(xy + 4z) -( -xy - 5z) 7 — x -—=— x 1 6 6 6 7a -(2a-9p) +(3p-2a) 6-(6n-2) +(4n-4) 6(abc-9a) +3(7a-4abc) -5(pq+pr) -(9pq+pr) 0.9x -0.7=1.8+6x
2 —- 2x = 4 +— 1 x 5 6 1 — (9x - 2) =— 2 x +4 6 5 y ——=+2 7 +—— y -3 3 6 1 — (2 - 4x) =— 2 (5x + 3) 6 5 4(x +7) -8(x+1) =8 7x -7(3-x) =-1 3x - 8(x -4) =15 7(5x+4) =11
( -— 1 ) + ( -— 5 ) + (- 7 7 8)
1 —- (- 1 — ) + ( - 6 —) 5 4 5 (- 0.8) ÷—× 1 (- 2) 2 ( -— 1 ) × ( -—+— 1 1 ) × 0 4 9
7 21÷[(-3) 2÷(-3)] 28- (-18) -7+(-11) (-2) 4-22 (-1) 1147
28+[(-2) 3-(-1]
1 1 1 (—- —) ÷(- —) 6 8 7 16+(-19) -10+(-11) 9 1 (—+ —) ×(-80) 8 2 (-4) 2-52 (-1) 2114 (-5)×(-4) 9-(-19) -2.5-(-11.5) 1 1 (-—) +(-—) 9 7 11+[4-(-20+6)] (-4)3-52 -13+17+(-13)-(-27) 3.3+(-0.2)-(-2.4)+3.4
2 1 1 4 (—+—) +(—+—) 9 8 7 7 9 7 2.8-(-—) +(-5.2) +— 5 5 -(7n-9)
x +5(9-6c)
7x +5(9y+9z) -(6x+y) -6(2n-8c) 1 —(16+4x) +z 2 -3(3a-9bc -3)
1 1 -—(y+z) -—(m+n) 9 5
4(7b+y) +2(n+7q)
-3a -(6a+7) 2(6a + 4) + 6a 2(ab - 8a) +(4a - 9b) 2(xy + 4z) -( -xy - 5z) 7 — x -—=— x 1 6 6 6 7a -(2a-9p) +(3p-2a) 6-(6n-2) +(4n-4) 6(abc-9a) +3(7a-4abc) -5(pq+pr) -(9pq+pr) 0.9x -0.7=1.8+6x
2 —- 2x = 4 +— 1 x 5 6 1 — (9x - 2) =— 2 x +4 6 5 y ——=+2 7 +—— y -3 3 6 1 — (2 - 4x) =— 2 (5x + 3) 6 5 4(x +7) -8(x+1) =8 7x -7(3-x) =-1 3x - 8(x -4) =15 7(5x+4) =11