Question

脱式计算，能简算的要简算

15.73-2.17-1.83+4.27 6.25/0.01-1.25*25*8
1/（1.75+1/4）-1/7 5 4/7+4 5/7*1/11-12 4/5/8*1/8

Answer 1

脱式计算，能简算的要简算
15.73-2.17-1.83+4.27
解，得：
==(15.73+4.27) --(2.17+1.83)
==20-4
==16‍

6.25/0.01-1.25*25*8
解，得：
==625-1.25*8*25
==625-10*25
==625-250
==375

1/（1.75+1/4）-1/7
解，得：
==1/(1.75+0.25)-1/7
==1/2-1/7
==5/14

54/7+45/7*1/11-12
解，得：
==99/7*1/11-12
==9/7-12
==1+2/7-11-7/7
==-10又5/7

4/5/8*1/8
解，得：
==4*8/5*1/8
==4*1/5
==4/5

Answer 2

15.73-2.17-1.83+4.27
= (15.73+4.27)- (2.17+ 1.83)
= 20 - 4
=16
6.25/0.01-1.25*25*8
= 625 - 1.25x8 x25
= 625 - 250
= 375

1/（1.75+1/4）-1/7
=1/ 2 - 1/7
=( 7-2) /14
= 5 / 14

5 4/7+4 5/7* 1/11-12 4/5/8*1/8
= 54/7 + 45 /(7x11) - 124 / (40x8)
= (54x11+45 ) /77 - 31/ 80
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