Practice problem
(1+2)+3=?(1+2)+3=?(1+2)+3=?
1+(2+3)1+(2+3)1+(2+3)
(2+4+1)(2+4+1)(2+4+1)
(4)+3(4)+3(4)+3
1×(2×3)1 \times (2 \times 3)1×(2×3)
Type a concept, like “slope” or “photosynthesis”.
