五道初一计算题
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五道初一计算题
五道初一计算题
五道初一计算题
⑴原式=(9x^8·y^4)²÷(4x²y²)³=(81x^16·y^8)÷(64x^6·y^6)=(81/64)x^10·y²
⑵原式=[mn(m/5-m²n+3n²)]÷mn=(m/5)-m²n+3n²
⑶原式=[(x+5)²-5²(x+1)²]÷x=[(x+5)+5(x+1)][(x+5)-5(x+1)]÷x
=(6x+10)·(-4x)÷x
=-24x-40
⑷原式=(2.5÷0.5)×{10^[(-5)﹣(-8)]}=5×10³=5000
⑸原式={(x-y)[(x+y)-(x-y)+2y]}÷4y=[(x-y)·4y]÷4y=x-y
计算: 3/(x-2)-2/(x+2)+8/(4+x^2) (a+b)^2+(a-b)^2+(-2a+b)(a+2b) (5x+3y+a)(5x-3y+a) 2/3x^3y^2*1/6xy*(-xy)^2 (a-b+c)(a+b-c)
1) 81/64x^10y^2
2) m/5-nm^2+3n^2
3) -24x-40
4) 5000
5) x-y