Вычислите 1)3 4/15- 2 1/8-1/24 2)-3-2 2/3- 4 5/6+7 - вопрос №13415218124232234567123156259413312402571990210 от 3toH 22.08.2021 10:05

Question

Математика: Вычислите 1)3 4/15- 2 1/8-1/24 2)-3-2 2/3- 4 5/6+7 1/2 3)1 5/6-2 5/9+4 1/3-3 1/2 4)0,25-7/12+0,5-1/6

3toH · Answer

1) 3 4/15 -2 1/8-1/24=49/15-17/8-1/24=(49*8-17*15-5)/120=
=(392-255-5)/120=132/120=11/10=1 1/10 =1.1
2) -3-2 2/3-29/6+7 1/2= -3-8/3-29/6+15/2=(-18-16-29+45)/6=-18/6=-3
3)1 5/6-2 5/9+4 1/3-3 1/2=11/6-23/9+13/3-7/2=(11*3-23*2+13*6-7*9)/18=
=(33-46+78-63)/18=2/18=1/9
4) 0.25-7/12+0.5-1/6=1/4-7/12+1/2-1/6=(1*3=7+1*6-1*2)/12=(3-7+6-2)/12=0/12=0