4.
\( (1) 15-7-4 = \\
(2) 12+4-8 = \\
(3) 4 \times 3 \times 3 = \\
(4) 18 \div 3 \times 2 = \\
(5) 3+15\div3 =\\
(6) 6 \times 2 – 7 = \\
(7) (7-4)\times7 = \\
(8) 22-4\times 4+3 = \\
(9) 13+32\div(2\times 4) = \\
(10) 6 + 2^3 = \\
(11) 2^3 \times 3^2 = \\
(12) (4^2-1)\div 3 =
\)