Ответ:

1)54,3×0,94-3,6×2,5+17,98×0,03=51,042-9+0,5394=42,5814 2)1,5:0,5×(3 8/15+4 1/18-1 1/5)=3/2:1/2×(16/5+73/18-6/5)=3/2×2×109/18=109/6=18 1/6

3)(2 5/18 -1/12+1 2/9)+(0,81:0,4)=(41/18-1/12+11/9)×2,025=41/12×81/40=41/4×27/40=1107/160=6 147/160

4)ответ сразу = 287/20×1/5-0,07/3=287/100-7/100/3=14/5/3=14/15=0,93

5)ответ =7-7/5×1/11/7/10×3/11=7-7/55/21/110=378/55/21/110=36

6)ответ =27/10×2×1/3-9/5×1/14/9/10×2×3/7=9/5-9/70/9/5×3/7=117/70/27/35=13/6=2 1/6 =2,16

Ответ:

Пошаговое объяснение:

1.

1) 54,3 * 0,94 = 51,042

2) 3,6 * 2,5 = 9

3) 17,98 * 0,03 = 0,5394

4) 51,042 - 9 + 0,5394 = 42,5814

2.

1) 3 8/15 + 4 1/18 - 1 1/5 =

3 48/90 + 4 5/90 - 1 18/90 = 6 35/90 = 6 7/18

2) 1,5 : 0,5 * 6 7/18 = 3 * 115/18 = 345/18 = 19 3/18 = 19 1/6

3.

1) 2 5/18 - 1/12 + 1 2/9 =

2 10/36 - 3/36 + 1 8/36 =

3 15/36 = 3 5/12

2) 0,81:0,4 = 2,025

3) 3 5/12 * 2,025 = 3 5/12 * 2 25/1000 = 3 5/12 * 2 1/40 = 41/12 * 81/40 = 1107/160 = 6 147/160

4.

1) 14,35 * 1/5 = 14,35 * 0,2 = 2,87

2) 1,05 : 15 = 0,07

3) 2,87 - 0,07 = 2,8 (числитель)

4) 36,3 * 0,01 = 0,363

5) 0,363 : 0,121 = 3 (знаменатель)

6) 2,8 / 3 = 2,8 : 3 = 2 8/10 : 3 = 2 4/5 : 3 = 14/5 * 1/3 = 14/15

5.

1) 2,1 * 1 1/3 = 2 1/10 * 1 1/3 = 21/10 * 4/3 = 84/30 = 14/5 = 2 4/5

2) 1,4 * 1/11 = 1 4/10 * 1/11 =

1 2/5 * 1/11 = 7/5 * 1/11 =

7/55

3) 2 4/5 - 7/55 = 2 44/55 - 7/55 = 2 37/55 (числитель )

4) 0,7 * 1 3/11 = 7/10 * 14/11 = 49/55 (знаменатель)

5) 2 37/55 / 49/55 =

2 37/55 : 49/55 = 147/55 * 55/49 = 147/49 = 3