24.7-1127-9271-0.125÷1884×0.25+14×16（2.5+3.6）×214+3.9×2140.875×12+0.125÷212-30%×0.2÷50%

Question

24.7-11 (2)/(7) -9 (2)/(7)	1-0.125÷ (1)/(8)
84×0.25+ (1)/(4) ×16	（2.5+3.6）×2 (1)/(4) +3.9×2 (1)/(4)
0.875× (1)/(2) +0.125÷2	(1)/(2) -30%×0.2÷50%

Answer 1

①24.7-11 (2)/(7) -9 (2)/(7) ，
=24.7-（11 (2)/(7) +9 (2)/(7) ），
=24.7-20 (4)/(7) ，
=4 (9)/(70) ；

②1-0.125÷ (1)/(8) ，
=1-0125÷0.125，
=1-1，
=0；

③84×0.25+ (1)/(4) ×16，
=84×0.25+0.25×16，
=0.25×（84+16），
=0.25×100，
=25；

④（2.5+3.6）×2 (1)/(4) +3.9×2 (1)/(4) ，
=2 (1)/(4) ×（2.5+3.6+3.9），
= (9)/(4) ×10，
=22.5；

⑤0.875× (1)/(2) +0.125÷2，
=0.875× (1)/(2) +0.125× (1)/(2) ，
= (1)/(2) ×（0.875+0.125），
= (1)/(2) ×1，
= (1)/(2) ．

⑥ (1)/(2) -30%×0.2÷50%，
=0.5-0.3×0.2×0.5，
=0.5-0.03，
=0.47．