Question

用完全平方公式计算:(1)(3a+b)^2 (2)(x-1/3)^2 (3)(-2/3a^2 +0.3a)^2 (4)(

Answer 1

15分钟打字也打不完,我试试

（1）9a^+6ab+b^2

(2)x^2-2/3x+1/9

(3)4/9a^4-2/5a^3+0.09a^2

(4)x^4y^2+1/3x^2yz+1/36z^2

(5)x^2+1/4y^2+4-xy+4x-2y

(6)a^2+b^2+c^2+2ab+2ac+2bc