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(1)计算:(?4)2×(?34)+30÷(?6);(2)化简:4(2...

(1)(?4)2×(?34)+30÷(?6)=16×(-34)+30÷(-6)=-12-5=-17;(2)4(2x2-xy)-(x2+xy-6)=8x2-4xy-x2-xy+6=7x2-5xy+6;(3)4(x-1)=1-x去括号,得4x-4=1-x移项,合并同类项,得5x=5系数化为1,得x=1;(4)x+12?2?3x3=1去分母,得3(x+1)-...

(1)12-(-18)+(-7)-15=12+18-7-15=30-22=8;(2)?4÷23?(?23)×(?30)=-6-20=-6;(3)(-16+34-112)×(-48)=16×48-34×48+112×48=8-36+4=-24;(4)(-1)10×2+(-2)3÷4+(-22)=(-1)×2+(-8)÷4+(-4)=-2-2-4=-8;(5)3(x2-y2)+(y...

(1)(-3-5)-(6-10)=-8-(-4)=-8+4=-4;(2)4÷(-2)-22=-2-4=-6;(3)(13-12+15)×30=13×30-12×30+15×30=10-15+6=1;(4)2a+3b-3a+6=2a-3a+3b+6=-a+3b+6;(5)4x2-8x+5-(3x2-6x+2)=4x2-8x+5-3x2+6x-2=4x2-3x2-8x+6x+5-2=-x2-2x+3;...

(1)(12)?2?4sin30°+(-1)2011+(π-2)0=4-4×12+(-1)+1=2.(2)(a2a+2?a+2)÷4aa2?4=[a2a+2?a(a+2)a+2+2(a+2)a+2]×(a+2)(a?2)4a=a?2a.由于a2-4≠0,所以a≠±2,把a=2代入a?2a,得原式=1-2.

(1)|3?2|+20100?(?13)?1+3tan30°,=2-3+1-(-3)+3×33,=2-3+1+3+3,=6;(2)(x2+4x?4)÷x2?4x2+2x,=(x?2)2x?x(x+2)(x+2)(x?2),=x-2;当x=-1时,原式=x-2=-1-2=-3.

(1)原式=1-12+2×22-1=1-12+1-1=12;(2)原式=x(x?2)(x+2)(x?2)÷(x+2)(x?2)?2(x?2)x+2=xx+2÷x(x?2)x+2=xx+2?x+2x(x?2)=1x?2.当x=2+2时,原式=12+2?2=22.

(1)原式=4-2-1+1=2;(2)原式=4a2-4ab+b2-2a2+2ab-2a2-b2,=-2ab,当a=3+1,b=3-1时,原式=-2(3+1)(3-1),=-2×2=-4.

3/2-1/n+1-1/n+2 =(3×(n+1)(n+2)-2(n+2)-2(n+1))/(2(n+1)(n+2)) =(3n²+9n+6-2n-4-2n-2)/(2(n+1)(n+2)) =(3n²+5n)/(2(n+1)(n+2)) =n(3n+5)/(2(n+1)(n+2))

二又四分之一:三十六 =9/4:36 =1:16

(1)原式=-16+1+12+4-12=-11;(2)原式=a?2+3a?2?2(a?2)(a+1)(a?1)=a+1a?2?2(a?2)(a+1)(a?1)=2a?1,当a=2+1时,原式=22=2.

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