6 цел 3/4-2 цел5/6-1 цел3/8 9 цел 8/15-4 цел 1/12+3 цел 7/20 7 цел5/8+3 цел2/3-8 цел3/16 9 цел23/25-4 цел7/10-2 цел1/5 20 - (3 цел1/6+2 цел3/4) 1 цел5/6 + (3-1 цел7/10) 2 цел1/8+8 цел1/12-5 цел5/6 3 цел3/5+3 цел11/15-1/12

Question

Полина Зуева

Математика

3 января, 07:02

6 цел 3/4-2 цел5/6-1 цел3/8 9 цел 8/15-4 цел 1/12+3 цел 7/20 7 цел5/8+3 цел2/3-8 цел3/16 9 цел23/25-4 цел7/10-2 цел1/5 20 - (3 цел1/6+2 цел3/4) 1 цел5/6 + (3-1 цел7/10) 2 цел1/8+8 цел1/12-5 цел5/6 3 цел3/5+3 цел11/15-1/12

+5

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Дарья Крылова · Answer 1

1) 6 3/4 - 2 5/6 - 1 3/8 = 27/4 - 17/6 - 11/8 = 162/24 - 68/24 - 33/24 = (162 - 68 - 33) / 24 =

= 61/24 = 2 13/24;

2) 9 8/15 - 49/12 + 3 7/20 = 143/15 - 49/12 + 67/20 = 572/60 - 245/60 + 201/60 =

= (572 - 245 + 201) 60 = 528/60 = 8 48/60 = 8 4/5 = 8,8;

3) 7 5/8 + 3 2/3 - 8 3/16 = 61/8 + 11/3 - 131/16 = 366/48 + 176/48 - 393/48 =

= (366 + 176 - 393) / 48 = 149/48 = 3 5/48;

4) 9 23/25 - 4 7/10 - 2 1/5 = 248/25 - 47/10 - 11/5 = 496/50 - 235/50 - 110/50 =

= (496 - 235 - 110) / 50 = 151/50 = 3 1/50;

5) 20 - (3 1/6 + 2 3/4) = 20 - 3 1/6 - 2 3/4 = 20 - 16/6 - 11/4 = 240/12 - 32/12 - 33/12 =

= (240 - 32 - 33) / 12 = 175/12 = 14 7/12;

6) 1 5/6 + 3 - 1 7/10 = 11/6 + 3 - 17/10 = 55/30 + 90/30 - 51/30 = (55 + 90 - 51) / 30 =

= 94/30 = 3 4/30;

7) 2 1/8 + 8 1/12 - 5 5/6 = 17/8 + 97/12 - 35/6 = 51/24 + 194/24 - 140/24 =

= (51 + 194 - 140) / 24 = 105/24 = 4 9/24 = 4 3/8;

8) 3 3/5 + 3 11/15 - 1/12 = 18/5 + 56/15 - 1/12 = 216/60 + 224/60 - 5/60 =

= (216 + 224 - 5) / 60 = 435/60 = 87/12 = 7 3/12 = 7 1/4 = 7,25;