Question

2-15/16÷5/7÷3/4 9/20÷[1/2×(2/5+4/5)] X-5/8X=1

Answer 1

2-15/16÷5/7÷3/4

=2-15/16*7/5*4/3

=2-7/4

=1/4

9/20÷[1/2×(2/5+4/5)]

=9/20/[1/2*6/5]

=9/20*5/3

=3/4

X-5/8X=1/3×45

3x/5=15

x=25

1/2X-1/3X+3/5X+2/5=5

(1/2-1/3+3/5)x=4.6

23x/30=4.6

x=6.9

0.8：4=X：8

4x=6.4

x=1.6