1. (2+3)² = 2. (2x3)² = 3. (2:3)² = 4. √400

1.2+3=5, 5x5=25
2.2x3=6, 6x6=36
3.?
4. 20

1. 25= 2×36= 3×0,4489=4×20
25=72=1,3467=80
(2+3)² = 5²= 25
(2×3)²= 6²= 36
(2÷3)²= 0,67²=0,4489
√400= 20