75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
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75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2
75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
0.75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
去括号并且小数全换成分数
3/4m^2n-3/2mn^2+2/3m^2n-13/10mn^2
后缀相同的分母扩大到相同加减
得17/12m^2n-14/5mn^2
2mn[（2mn）^2-3n（mn+m^2*n）-mn^2]计算
2mn[(2mn)²-3n（mn+m²n）-mn²
(5mn-2m+3n)+(-7m-7mn)
(5mn-2m+3n)+(-7m-7mn)
急2[mn+(-3m)]-3(2n-mn),m+n=2 mn=-3
75m^2n-[3/2mn^2-(2/3m^2n-1.3mn^2)]
3(m^2n+mn)-4(mn-2m^2n)+mn.要有过程
1/M+1/N=5 (3M+MN+2N) / (M-MN=3N)
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(3m^2n^3)/mn)^2
(3m^2n^3)/(mn^2)