1) (x²+3y)²=(x²+3y)(x²+3y)=x⁴+3x²y+3x²y+9y²=x⁴+6x²y+9y²
2) (0,3a²+4b)²=(0,3a²+4b)(0,3a²+4b)=
0,09a⁴+1,2a²b+1,2a²b+16b²=0,09a⁴+2,4a²b+16b²
3) (0,2m²-5n)²=(0,2m²-5n)(0,2m²-5n)= 0,04m⁴-10m²n-10m²n+25n²= 0,04m⁴-20m²n+25n²
4) (1,3p³+2,5p²)²=(1,3p³+2,5p²)(1,3p³+2,5p²)=1,69p^6+325p^5+325p^5+625p⁴=1,69p^6+650p^5+625p⁴