Giải thích các bước giải:
`A=49 8/23-(5 7/32+14 8/23)`
`=49 8/23-5 7/32-14 8/23`
`=35 -5 7/32`
`=29 25/32`
`B=71 38/45-(43 8/45 -1 17/57)`
`= 71 38/45 -43 8/45 +1 17/57`
`=28 2/3+1 17/57`
`=29 55/57`
`C=-3/7*5/9+4/9*-3/7+2 3/7`
`=-3/7(5/9+4/9)+16/7`
`=-3/7+16/7`
`=13/7`
`D=(19 5/8 :7/12 -13 1/4:7/12)*4/5`
`=(19 5/8*12/7 -13 1/4 *12/7)*4/5`
`=12/7(19 5/8-13 1/4)*4/5`
`=12/7*51/8*4/5`
`=306/35`
`M=-3/7+16/26-(2/13-3/7)`
`=-3/7+15/26-2/13+3/7`
`=15/26-2/13`
`=11/26`
`N=2 3/7+(2/9-1 3/7)-5/3:1/9`
`=2 3/7 + 2/9 -1 3/7-5/3*9`
`=(2 3/7-1 3/7)+2/9-15`
`=1+2/9-15`
`=-124/9`
`P=-11/23*6/7+8/7*-11/23-1/23`
`=-11/23(6/7+8/7)-1/23`
`=-11/23*2-1/23`
`=-2/23-1/23`
`=-1`
`E=0,7*2 2/3 *20*0,375*5/28`
`=7/10*8/3*20*3/8*5/28`
`=(8/3*3/8)*(7/10*20)*5/28`
`=1*14*5/28`
`=14*5/28`
`=5/2`