计算,(x+2)(y+3) (3mn-2)² 2(x²+5xy)-6(2xy-1/3x²) (X+2)(X-3)-(X+1))(X-2)1.(x+2)(y+3) 2.(3mn-2)² 3.2(x²+5xy)-6(2xy-1/3x²) 4.(X+2)(X-3)-(X+1))(X-2) 5.(X+2Y)²-(X +Y)(X-Y),其中X=-2,Y=1/2 6.(3XY²).(-2XY) 7.(2A+1)&

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计算,(x+2)(y+3)(3mn-2)²2(x²+5xy)-6(2xy-1/3x²)(X+2)(X-3)-(X+1))(X-2)1.(x+2)(y+3)2.(3mn-2

计算,(x+2)(y+3) (3mn-2)² 2(x²+5xy)-6(2xy-1/3x²) (X+2)(X-3)-(X+1))(X-2)1.(x+2)(y+3) 2.(3mn-2)² 3.2(x²+5xy)-6(2xy-1/3x²) 4.(X+2)(X-3)-(X+1))(X-2) 5.(X+2Y)²-(X +Y)(X-Y),其中X=-2,Y=1/2 6.(3XY²).(-2XY) 7.(2A+1)&
计算,(x+2)(y+3) (3mn-2)² 2(x²+5xy)-6(2xy-1/3x²) (X+2)(X-3)-(X+1))(X-2)
1.(x+2)(y+3) 2.(3mn-2)² 3.2(x²+5xy)-6(2xy-1/3x²) 4.(X+2)(X-3)-(X+1))(X-2) 5.(X+2Y)²-(X +Y)(X-Y),其中X=-2,Y=1/2 6.(3XY²).(-2XY) 7.(2A+1)²-(2A+1)(-1+2A)

计算,(x+2)(y+3) (3mn-2)² 2(x²+5xy)-6(2xy-1/3x²) (X+2)(X-3)-(X+1))(X-2)1.(x+2)(y+3) 2.(3mn-2)² 3.2(x²+5xy)-6(2xy-1/3x²) 4.(X+2)(X-3)-(X+1))(X-2) 5.(X+2Y)²-(X +Y)(X-Y),其中X=-2,Y=1/2 6.(3XY²).(-2XY) 7.(2A+1)&
1.xy+3x+2y+6
2.9m²n²—6mn+4
3.(2x²+10xy)—12xy+2x²=4x²—2xy
4.(x²—3x+2x—6)—(x²—2x+x—2)=x²—x—6—x²+x—2=-8
5.x²+4xy+4y²—x²+y²=4xy+5y²,当x=-2,y=1/2时,原式等于:4+5/4=21/4
6.-6x²y³
7.4a²+4a+1—4a²+1=4a+2