1、12a224a12化简并求值:(mn)2(mn)(mn),其中m1,n1化简:(x1)(x1)2(x22)16x34x=a2b5a4x34x2x27x292520(xy)4(xy)299x212x312x23x(a4b)2(4ab)28a28a23(mn)2(mn)(mn),其中m3,n3(x3)(x3)3(x25)x316x=ab9ax34x24x18x2948(xy)4(xy)2169x2(2a4b)2(3ab)23a212a122(mn)2(3mn)(m2n),其中m3,n1(x2)(x2)2(x24)x34x=a3b2ax310x225x75x22516(xy)9(xy)24x23x3
2、12x212x(a3b)2(3a2b)22a24a24(mn)2(3mn)(m2n),其中m2,n1a2b4ax38x216x25x225110(xy)25(xy)28x316x28x(2a3b)2(3ab)212a224a12(mn)2(2mn)(m3n),其中m2,n1(x1)(x1)2(x24)25x325x=9x318x29x50x225412(xy)9(xy)2916x23x36x23x(a3b)2(4ab)23(mn)2(2mn)(mn),其中m1,n2(x4)(x4)2(x21)9x34x=a3ba9x36x2x16x216912(xy)4(xy)2(2a4b)2(3ab)28a
3、28a24(mn)2(mn)(m3n),其中m2,n3(x2)(x2)2(x25)x3x=ab8a4x312x29x3660(xy)25(xy)22x34x22x(2a3b)2(3ab)28a216a8(x4)(x4)2(x24)a2b7a3x213612(xy)(xy)22x38x28x(a3b)2(3ab)2(mn)2(3mn)(mn),其中m3,n1(x4)(x4)3(x24)16x336x=a3b8ax36x29x2x2194x28x38x22x(a3b)2(3a2b)22(mn)2(mn)(m3n),其中m2,n3(x3)(x3)3(x23)25x336x=32x216420(xy)25(xy)23a26a34(mn)2(2mn)(m2n),其中m3,n316x325x=a2ba16x38x2x8x24168(xy)(xy)2