умоляю ответьте на всё 1) 1,26×10/27:0,84-5/6=
2) 64/155×4,65:0,18+1 1/3=
3) 5 1/21×0,9:6 2/35-0,5=
4) 7,5×2 31/40:16/65+0,25=
дам 25

Пошаговое объяснение:

1) 1,26×10/27:0,84-5/6= 126/100*10/27:84/100-5/6=126/10*1/27*100/84-5/6=126/1*1/27*10/84-5/6=126/27*10/84-5/6=5/9-5/6=(5*2-5*3)/18=-5/18

2) 64/155×4,65:0,18+1 1/3=12

64/155*465/100=64/1*3/100=32/1*3/50=16/1*3/25=48/25

48/25:18/100=48/25*100/18=48/1*4/18=48/1*2/9=96/9

96/9+1 1/3=96/9+(1*3+1)/3=(96+4*3)/9=108/9=12

3) 5 1/21×0,9:6 2/35-0,5=-1/20

(5*21+1)/21*9/10=106/21*9/10=106/7*3/10=318/70

318/70:6 2/35=318/70:212/35=318/70*35/212=3/4

3/4-0,5=3/4-8/10=(3*5)/20-(8*2)/20=-1/20

4) 7,5×2 31/40:16/65+0,25=21709/256 или 84 205/256

75/10*(2*40+31)/40=75/10*111/40=333/16

333/16:16/65=333/16*65/16=21645/256

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