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(2+3)²=2²+2*2*3+3²=4+12+9=25
5*5=25
25=25
B)3²+4²=7²
3²+4²=9+16=25
7²=49
25=/=49
C)4²:2²=1-5+8
4²:2²=16:4=4
1-5+8=-4+8=4
4=4
D)3²-1²=4²-2*2²
3²-1²=9-1=8
4²-2*2²=16-2*4=56
8=/=56
F) 3²*(2²-3)=6²-3²
3²*(2²-3)=9*(4-3)=36-27=9
6²-3²=36-9=27
9=/=27