Arrange numbers 1 to 10 to the UP triangles, with rules :
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10 2 * 5 8 / 4 - 9 1 + 7 - 3 + 6
The image version created with my awesome pinta skills.
J can only be 6, 8 or 10.
I started with j = 10 randomly.
this means H and I can be 2 and 5.
I put H =2 since it can be obtained from a fraction (8/4) and 5 cannot.
Obviously G = 9.
From here see if the rest of the numbers fit.