2xy=33X7y=12
计算下列各题 -
4.解:原式=x^2y[(-12xy)·3-(3xy)=-3x^3 y^2(12xy-1) {“·”表乘} 5.解:原式=(x)^6=x^6 6.解:原式=[x^2+4y^2-4xy+x^2-4y^2-4x^2+2xy]÷=(-2x^2-2xy)·1/2x=-y-x 7.解:原式=2ab^2-b^3/2b^3=2a-b/2b 8.解:原式=x^2-4 9.解:..
7.2y+(-2y+5)-(3y+2)=___. 11.(2x2-3xy+4y2)+(x2+2xy-3y2)=___. 12.2a-(3a-2b+2)+(3a-4b-1)=___. 13.-6x2-7x2+15x2-2x2=___. 14.2x-(x+3y)-(-x-y)-(x-y)=___. 16.2x+2y-[3x-2(x-y)]=___. 17.5-(1-x)-1-(x-1)=___. 18.( )+(4xy+7x2-y2)=后面会介绍。
4.解:原式=x^2y[(-12xy)·3-(3xy)=-3x^3 y^2(12xy-1) {“·”表乘} 5.解:原式=(x)^6=x^6 6.解:原式=[x^2+4y^2-4xy+x^2-4y^2-4x^2+2xy]÷=(-2x^2-2xy)·1/2x=-y-x 7.解:原式=2ab^2-b^3/2b^3=2a-b/2b 8.解:原式=x^2-4 9.解:..
7.2y+(-2y+5)-(3y+2)=___. 11.(2x2-3xy+4y2)+(x2+2xy-3y2)=___. 12.2a-(3a-2b+2)+(3a-4b-1)=___. 13.-6x2-7x2+15x2-2x2=___. 14.2x-(x+3y)-(-x-y)-(x-y)=___. 16.2x+2y-[3x-2(x-y)]=___. 17.5-(1-x)-1-(x-1)=___. 18.( )+(4xy+7x2-y2)=后面会介绍。
12,(x-2y)3=x3-6x²y+12xy²-8y3, 13(2x+y+3z)²=4x²+y²+9z²+4xy+6yz+12zx 15,(2x-y+3z)²=4x²+y²+9z²-4xy-6yz+12zx 16,(2x+y-3z)²=4x²+y²+9z²+4xy-6yz-12zx, 18,(2x+y)(4x²-2xy+y²)=-8x3+y3, 19,(2x-y)(4x²+2xy+y²)说完了。
(3) -x2(2y2-xy)=-2xy2-x3y ( )2、计算题:3) (4) -3x(-y-xyz)(5) 3x2(-y-xy2+x2) (6) 2ab(a2b- c)(7) (a+b2+c3)·(-2a)(8) [-(a2)3+(ab)2+3]·(ab3)检举回答人的补充 2009-08-17 09:13 脱式计算: (15.6+9.744/2.4)*0.5 有帮助请点赞。
急需数学计算题,初一下册 -
x2y +2xy2 –y3 +3xy2 –4x2y-x3 3ab-4ab+8ab-7ab+ab=___.7x-(5x-5y)-y=___.23a3bc2-15ab2c+8abc-24a3bc2-8abc=___.-7x2+6x+13x2-4x-5x2=___.2y+(-2y+5)-(3y+2)=___.1. 3/7 × 49/9 - 4/3 2. 8/9 × 15/36 + 1/27 3. 12× 5/6 –等会说。
因式分解x2+x+y2-y-2xy=? 若x-y=99求x2+x+y2-y-2xy之值? (一)计算题: (1)(-4)(+6)(-7) (2)(-27)(-25)(-3)(-4) (3)0.001*(-0.1)*(1.1) (4)24*(-5/4)*(-12/15)*(-0.12) (5)(-3/2)(-4/3)(-5/4)(-6/5)(-7/6)(-8/7) (6)(-24/7)(11/8+7/3-希望你能满意。
-23+29+60+0=0? -
39+[-23]+0+[-16]= 0 [-18]+29+[-52]+60= 19 [-3]+[-2]+[-1]+0+1+2= -3 [-301]+125+301+[-75]= 50 [-1]+[-1/2]+3/4+[-1/4]= -1 [-7/2]+5/6+[-0.5]+4/5+19/6= 1.25 [-26.54]+[-6.14]+18.54+6.14= -8 1.125+[-17/5]+[-1/8]后面会介绍。
26.-(2x2-y2)-[2y2-(x2+2xy)]=___. 27.若-3a3b2与5ax-1by+2是同类项,则x=___,y=___. 28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=___. 29.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是___. 30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ). 31.3a-(2a-3b)+3(a-说完了。
33道简算题,33道应用题,22道文字题,22道脱式计算 -
3 53.(-7)*2/(1/3)+79/(3+6/4)54.123+456+789+98/(-4)55.369/33-(-54-31/15.5)56.39+{3x[42/2x(3x8)]} 57.9x8x7/5x(4+6)58.11x22/(4+12/2)59.94+(-60)/10 1.a^3-2b^3+ab(2a-b)=a^3+2a^2b-2b^3-ab^2 =a^2(a+2b)-b^2(2b+a)等会说。
因式分解y2(x-y)+z2(y-x) 设x+1是2x2+ax-3的因式,(1)求a=? (2)求2x2+ax-3=0之二根因式分解x2+x+y2-y-2xy=? 若x-y=99求x2+x+y2-y-2xy之值? (一)计算题: (1)(-4)(+6)(-7) (2)(-27)(-25)(-3)(-4) (3)0.001*(-0.1)*(1.1) (4)24*(-5/4)*(-12/15)*有帮助请点赞。