( -— 2 ) + ( -— 1 ) - (- 7 7 4)
1 —+ (- 1 — ) - ( - 6 —) 3 2 5 (- 0.2) ÷—× 1 (- 3) 4 ( -— 1 ) ÷ ( -—+— 1 1 ) × 0 2 9
2 28-[(-4) 3×(-3)] 5- (-27) +2+(-20) (-3) 2+52 (-1) 2104
9-[(-3) 2×(-3]
1 1 1 (—+ —) +(- —) 6 2 4 23+(-12) -4×(-12) 1 6 (—+ —) ×(-70) 2 5 (-4) 4-42 (-1) 1680 (-10)÷(-3) 16×(-19) 13+(-5) 1 1 (-—) -(-—) 4 4 -15-[-5-(-13-6)] (0)4-24 -14-19-(-11)+(-21) 3.1-(-4.5)-(-5)+4.4
2 1 1 1 (—-—) -(—+—) 7 3 2 5 7 9 2.4-(-—) -(-4.3) -— 5 5 -(2y-8)
y -4(8+8c)
20a -3(5b-6z) -(5a-b) +8(9y+7c) 1 —(12-2y) -z 7 -9(3a+3xy -6)
1 1 -—(b+c) -—(p+q) 8 8
3(7a-x) -3(m-9p)
-2x +(3x-2) 6(3m + 2) - 8m 2( - ab -7a) - (6a - 5b) 2(xy + 9z) -( -xy - 9z) 7 — x -—=— x 1 3 8 3 x +(3x+2s) +(7s+x) 6+(4b-9) +(8b+6) 16(abc+8a) -5(4a-3abc) -3(pq+pr) +(6pq-pr) 0.5x -0.4=6.7-1.7x
2 —- 9x = 1 +— 1 x 5 7 1 — (7x - 4) =— 1 x -9 8 5 y ——=-3 2 +—— y +1 2 6 1 — (5 + 4x) =— 2 (5x - 1) 8 7 7(x -8) +5(x-2) =12 3x +4(2-x) =-8 1x + 1(x -7) =50 6(3x-8) =19
( -— 2 ) + ( -— 1 ) - (- 7 7 4)
1 —+ (- 1 — ) - ( - 6 —) 3 2 5 (- 0.2) ÷—× 1 (- 3) 4 ( -— 1 ) ÷ ( -—+— 1 1 ) × 0 2 9
2 28-[(-4) 3×(-3)] 5- (-27) +2+(-20) (-3) 2+52 (-1) 2104
9-[(-3) 2×(-3]
1 1 1 (—+ —) +(- —) 6 2 4 23+(-12) -4×(-12) 1 6 (—+ —) ×(-70) 2 5 (-4) 4-42 (-1) 1680 (-10)÷(-3) 16×(-19) 13+(-5) 1 1 (-—) -(-—) 4 4 -15-[-5-(-13-6)] (0)4-24 -14-19-(-11)+(-21) 3.1-(-4.5)-(-5)+4.4
2 1 1 1 (—-—) -(—+—) 7 3 2 5 7 9 2.4-(-—) -(-4.3) -— 5 5 -(2y-8)
y -4(8+8c)
20a -3(5b-6z) -(5a-b) +8(9y+7c) 1 —(12-2y) -z 7 -9(3a+3xy -6)
1 1 -—(b+c) -—(p+q) 8 8
3(7a-x) -3(m-9p)
-2x +(3x-2) 6(3m + 2) - 8m 2( - ab -7a) - (6a - 5b) 2(xy + 9z) -( -xy - 9z) 7 — x -—=— x 1 3 8 3 x +(3x+2s) +(7s+x) 6+(4b-9) +(8b+6) 16(abc+8a) -5(4a-3abc) -3(pq+pr) +(6pq-pr) 0.5x -0.4=6.7-1.7x
2 —- 9x = 1 +— 1 x 5 7 1 — (7x - 4) =— 1 x -9 8 5 y ——=-3 2 +—— y +1 2 6 1 — (5 + 4x) =— 2 (5x - 1) 8 7 7(x -8) +5(x-2) =12 3x +4(2-x) =-8 1x + 1(x -7) =50 6(3x-8) =19