34^2+34乘以32+16^2
=34^2+2*34*16+16^2
=(34+16)²
=50²
=2500
225-15乘以26+13^2
=15²-2*15*13+13²
=(15-13)²
=4
1-2^2+3^2-4^2+5^2-6^2+…+99^2-100^2
=(1+2)(1-2)+(3+4)*(3-4)+(5+6)(5-6)+----+(99+100)(99-100)
=-(1+2+3+4+-------------+100)
=-5050
34^2+34乘以32+16^2
=34^2+2*34*16+16^2
=(34+16)²
=50²
=2500
225-15乘以26+13^2
=15²-2*15*13+13²
=(15-13)²
=4
1-2^2+3^2-4^2+5^2-6^2+…+99^2-100^2
=(1+2)(1-2)+(3+4)*(3-4)+(5+6)(5-6)+----+(99+100)(99-100)
=-(1+2+3+4+-------------+100)
=-5050