Реши примеры и уравнения.

1. * $12 + 38 - 33 = 50 - 33 = 17$ * $55 - (20 + 8) = 55 - 28 = 27$ * $42 - 16 - 20 = 26 - 20 = 6$ * $8 \cdot 3 : 6 = 24 : 6 = 4$ * $3 \cdot (8 : 2) = 3 \cdot 4 = 12$ * $36 : 9 \cdot 7 = 4 \cdot 7 = 28$ * $(48 - 16) : 8 = 32 : 8 = 4$ * $14 + 35 : 7 = 14 + 5 = 19$ * $6 \cdot (20 - 16) = 6 \cdot 4 = 24$ 2. * $31 - (10 - 3) = 31 - 7 = 24$ * $54 - (12 + 8) = 54 - 20 = 34$ 3. * $3 + 6 : 2 = 3 + 3 = 6 \ne 9$ * $3 \cdot 6 - 2 = 18 - 2 = 16 \ne 9$ * $3 \cdot 6 : 2 = 18 : 2 = 9$ * $7 + 3 \cdot 9 = 7 + 27 = 34 \ne 30$ * $7 \cdot 3 + 9 = 21 + 9 = 30$ * $9 + 3 \cdot 6 = 9 + 18 = 27 \ne 18$ * $9 \cdot 3 - 6 = 27 - 6 = 21 \ne 18$ * $9 \cdot 3 : 6 = 27 : 6 = 4,5 \ne 18$ * $9 \cdot 3 + 6 = 27 + 6 = 33 \ne 18$ * $9 + 3 + 6 = 18$ * $2 + 8 - 9 = 1 \ne 7$ * $2 \cdot 8 : 9 = 1,77 \ne 7$ * $2 - 8 + 9 = 3 \ne 7$ * $2 \cdot 8 - 9 = 7$ 4. * $8 \cdot 7 = 56$ * $6 \cdot 7 = 42$ * $9 \cdot 7 = 63$ * $4 \cdot 7 = 28$ * $3 \cdot 7 = 21$ * $1 \cdot 7 = 7$ * $42 : 6 = 7$ * $30 : 6 = 5$ * $54 : 6 = 9$ * $36 : 6 = 6$ * $18 : 6 = 3$ 5. * $14 + 7 = 21$ * $35 + 7 = 42$ * $63 + 7 = 70$ * $56 + 7 = 63$ * $42 + 7 = 49$ * $21 + 7 = 28$ * $30 - 6 = 24$ * $12 - 6 = 6$ * $24 - 6 = 18$ * $42 - 6 = 36$ * $6 - 6 = 0$