1.173^2-174*172 2.12345^2-12346*12344 3.（x+3)(x-1)-x(x+4) 4.(2m-3n)(m+4n)-(m+n)(2m+5n)
问题描述：
1.173^2-174*172 2.12345^2-12346*12344 3.（x+3)(x-1)-x(x+4) 4.(2m-3n)(m+4n)-(m+n)(2m+5n)
5.(3x-4y)(-3x-4y)-(-2x-y)(-2x+y) 6.(1/3a+3/2b)(1/3a-3/2b) 7.(2a+1)^2-(2a-1)^2 8.-3x(x+1)(x-1)-x(3x+2)(2-3x) 9.-4(2y-1/2)(1/2+2y)+3(2x-3)(2x+1) 10.(a+2)(a-2)-a(a+1) 11.(x+1/3)(x^2+1/9)(x-1/3) 12.(2^2+1)(2^4+1)(2^8+1)(2^16+1)
答
1.173^2-174*172 =173²-(173+1)(173-1)=173²-173²+1=12.12345^2-12346*12344 =12345²-(12345+1)(12345-1)=12345²-12345²+1=13.（x+3)(x-1)-x(x+4)=x²+2x-3-x²-4x=-2x-34.(2...