在计算[5m]
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(5m+2n)(5m-2n)+(3m+2n)^2-3m(11m+4n)=25m^2-4n^2+9m^2+12mn+4n^2-33m^2-12mn=25m^2+9m^2-33m^2+12mn-12mn+
d,符号保留,指数相加.
[5(m+n)2(m-n)]3÷【3(m+n)2(n-m)]2=125(m+n)的6次方(m-n)³÷9(m+n)的4次方(m-n)²=125/9(m+n)²(m-n)如
=-(4m-5)(4m+5)+(3m+1)(3m-1)=-(16m²-25)+9m²-1=-16m²+25+9m²-1=24-7m²
1/(m^2-m)+(m-5)/(2m^2-2)=1/m(m-1)+(m-5)/2(m+1)(m-1)=2(m+1)/2m(m+1)(m-1)+m(m-5)/2m(m+1)(m-1)=[2(m+1)+
5(m+n)(m-n)-2(m+n)^2-3(m-n)^2=5(m^2-n^2)-2(m^2+2mn+n^2)-3(m^2-2mn+n^2)=5m^2-5n^2-2m^2-4mn-2n^2-3m^2+
(3m-1)(m+1)+(2m-1)(m-1)-(3m+5)(m-2)=3m²+2m-1+2m²-3m+1-3m²+m+10=2m²+10=2(m²+
原式=25m²-4n²+9m²+12mn+4n²-33m²-12mn=m²结果里没有n所以你错了,结果也是一样的m²=25所以m=
圆钢盘条(kg/m)W=0.006165×d2d=直径mm直径100mm的圆钢,求每m重量.每m重量=0.006165×1002=61.65kg螺纹钢(kg/m)W=0.00617×d2d=断面直径m
3(m+1)²-5(m+1)(m-1)+2(m-1)²可以用式子相乘法进行分解因式=【3(m+1)-2(m-1)】【(m+1)-(m-1)】=(3m+3-2m+2)(m+1-m+1
原式=(1+2015)m/(2×2)-(2+2014)m/(2×2)=0
前面括号和后面括号里是:各有(1+2009)/2=1005项去掉括号,写成1-2+3-4+5-6.+2009-2010相当于1005个-1相加,最后是-1005
(m+3m+5m+...+2009m)-(2m+4m+6m+...+2010m)=2010m/2=1005m
2010m/2=1005m(m+3m+5m+…+2011m)-(2m+4m+6m+…+2010m)=(m+3m+5m+…+2011m)-2m-4m-6m-...-2010m=m-2m+3m-4m+5m
=(m-2m)+(3m-4m)+.(一共2010/2=1005项)+2011m=-1005m+2011m=1006m
1/(m^2-m)+(m-5)/(2m^2-2)=1/[m(m-1)]+(m-5)/[2(m+1)(m-1)]=2(m+1)/[2m(m+1)(m-1)]+m(m-5)/[2m(m+1)(m-1)]=
[(x-y)^3]^m[(x-y)^m]^5=[(x-y)^m]^3[(x-y)^m]^5=[(x-y)^m]^(3+5)=(x-y)^m]^8
1题functiony=lilu_fact(n)n=floor(n);%如果是小数,向下取整至整数y=1;ifn>1%这里负数,0的阶乘都将得到1fori=1:ny=y*i;endend2题funct
13*(5+2)*18=1638元