计算:(1)(?13)?2+(19)0+(?5)3÷(?5)2(2)(23)2009×(1.5)2008×(?1)2009(3)(-2a)6-(-3a3)2-[-
计算:(1)(?13)?2+(19)0+(?5)3÷(?5)2(2)(23)2009×(1.5)2008×(?1)2009(3)(-2a)6-(-3a3)2-[-(2a)...
计算:(1)(?13)?2+(19)0+(?5)3÷(?5)2(2)(23)2009×(1.5)2008×(?1)2009(3)(-2a)6-(-3a3)2-[-(2a)2]3(4)-3(x2-xy)-x(-2y+2x)(5)(m+12n)(m?12n)(6)(2x-3y)2-(y+3x)(3x-y)(7)(2m+n-p)(2m-n+p)(8)已知xm=3,xn=2,求x3m+2n的值.
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(1)原式=9+1-125÷25
=9+1-5
=5;
(2)原式=(
×1.5)2008×(
)×(-1)2009
=1×
×(-1)
=-
;
(3)原式=64a6-9a6+64a6
=119a6;
(4)原式=-3x2+3xy+2xy-2x2
=-5x2+5xy;
(5)原式=m2-(
n2)
=m2-
n2;
(6)原式=4x2+9y2-12xy-(3xy-y2+9x2-3xy)
=4x2+9y2-12xy+y2-9x2
=-5x2+10y2-12xy;
(7)原式=4m2-2mn+2mp+2mn-n2+np-2mp+np-p2
=4m2-n2-p2+2np;
(8)原式=x3m?x2n=(xm)3?(xn)2,
∵xm=3,xn=2,
∴原式=33×22=27×4=108.
=9+1-5
=5;
(2)原式=(
2 |
3 |
2 |
3 |
=1×
2 |
3 |
=-
2 |
3 |
(3)原式=64a6-9a6+64a6
=119a6;
(4)原式=-3x2+3xy+2xy-2x2
=-5x2+5xy;
(5)原式=m2-(
1 |
2 |
=m2-
1 |
4 |
(6)原式=4x2+9y2-12xy-(3xy-y2+9x2-3xy)
=4x2+9y2-12xy+y2-9x2
=-5x2+10y2-12xy;
(7)原式=4m2-2mn+2mp+2mn-n2+np-2mp+np-p2
=4m2-n2-p2+2np;
(8)原式=x3m?x2n=(xm)3?(xn)2,
∵xm=3,xn=2,
∴原式=33×22=27×4=108.
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