Simple calculation: (1 / 6 + 1 / 7) * 6 * 7 0.6 + 3 / 5 * 5 / 8 - 3 / 8 * 60% 2.9 * (3.8-4 / 5) / (13 / 8 + 5 / 8) solve equations: 7.2*8-10X=3.6 1 + four fifths x = 72 * one ninth Simple calculation: One eighth * 35 + 65 / 8 Three fifths * 31 + 69 * 60% (3 / 4-5 / 8) / (1 / 2-1 / 3) [3 / 4 - (7 / 16 - 0.25) * 17 / 9] solve equations: (x + 2 / 7) * 40% = 8 X+5%X=19.95

Simple calculation: (1 / 6 + 1 / 7) * 6 * 7 0.6 + 3 / 5 * 5 / 8 - 3 / 8 * 60% 2.9 * (3.8-4 / 5) / (13 / 8 + 5 / 8) solve equations: 7.2*8-10X=3.6 1 + four fifths x = 72 * one ninth Simple calculation: One eighth * 35 + 65 / 8 Three fifths * 31 + 69 * 60% (3 / 4-5 / 8) / (1 / 2-1 / 3) [3 / 4 - (7 / 16 - 0.25) * 17 / 9] solve equations: (x + 2 / 7) * 40% = 8 X+5%X=19.95

Simple calculation:
(1 / 6 + 1 / 7) * 6 * 7
=1/6*6*7+1/7*6*7
=7+6
=13
0.6 + 3 / 5 * 5 / 8 - 3 / 8 * 60%
=0.6*（1+5/8-3/8）
=0.6*5/4
=0.75
2.9 * (3.8-4 / 5) / (13 / 8 + 5 / 8)
=2.9*3/2
=8.7/2
=4.35
solve equations:
7.2*8-10X=3.6
57.6-10X=3.6
10X=54
X=5.4
1 + four fifths x = 72 * one ninth
1+0.8X=8
0.8X=7
X=8.75
One eighth * 35 + 65 / 8
=1/8*(35+65)
=1/8*100
=12.5
Three fifths * 31 + 69 * 60%
=0.6*(31+69)
=0.6*100=60
(3 / 4-5 / 8) / (1 / 2-1 / 3)
=1/8÷1/6
=3/4
[3 / 4 - (7 / 16-0.25) * 17 / 9] / 19 / 24 = [3 / 4-3 / 16 * 17 / 9] × 24 / 19
=[3/4-17/48]×24/19
=19/48×24/19
=1/2
solve equations:
(x + 2 / 7) * 40% = 8
X+2/7=20
X = 19 and 5 / 7
X+5%X=19.95
0.95X=19.95
X=21