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)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)&](/uploads/image/z/11640647-47-7.jpg?t=%E8%AE%A1%E7%AE%97%2C%28x%2B2%29%28y%2B3%29+%283mn-2%29%26%23178%3B+2%28x%26%23178%3B%2B5xy%29-6%282xy-1%2F3x%26%23178%3B%29+%28X%2B2%29%28X-3%29-%28X%2B1%29%29%28X-2%291.%28x%2B2%29%28y%2B3%29+2.%283mn-2%29%26%23178%3B+3.2%28x%26%23178%3B%2B5xy%29-6%282xy-1%2F3x%26%23178%3B%29+4.%28X%2B2%29%28X-3%29-%28X%2B1%29%29%28X-2%29+5.%28X%2B2Y%29%26%23178%3B-%28X+%2BY%29%28X-Y%29%2C%E5%85%B6%E4%B8%ADX%3D-2%2CY%3D1%2F2+6.%283XY%26%23178%3B%29.%28-2XY%29+7.%282A%2B1%29%26)
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