Tolong jawab nmor 1-4 yah,makasih

1.3+3x4-6:2-12 = 3+12-3-12 = 15-3-12 = 12-12 = 0
2.7x2-21:3+3 = 14-7+3 = 7+3 = 10
3.2 x (3+4) -10+1 = 2x7-10+1 = 14-11 = 3
4.( 1/2 : 2 ) + ( 1/2 : 4 ) = 1 + 2 = 3

1.3+3x4-6:2-12=?
3+12-3-12=?
15-3-12=?
15-3-12=0
2.7x2-21:3+3=?
14-7+3=?
7+3=10
3.2x(3+4)-10+1=?
2x(7)-10+1=?
14-10+1=5
4.1/2:2+1/2:4=1+2=3

maaf yah telat jawab:)