(1)计算:①(-3xy2)3?(16x3y)2; ②4a2x2?(-2...
(1)计算:①(-3xy2)3?(16x3y)2;②4a2x2?(-25a4x3y3)÷(-12a5xy2).(2)因式分解:①x2+y2-1-2xy;②(a-b)(3a...
(1)计算:①(-3xy2)3?(16x3y)2; ②4a2x2?(-25a4x3y3)÷(-12a5xy2).(2)因式分解:①x2+y2-1-2xy; ②(a-b)(3a+b)2+(a+3b)2(b-a).(3)解方程:(x+3)(2x-5)-(2x+1)(x-8)=41.
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(1)①原式=-27x3y6?
x6y2
=-
x9y8;
②原式=-
a6x5y3+(-
a5xy2)
=
ax4y;
(2)①原式=(x2+y2-2xy)-1=(x-y)2-1
=(x-y+1)(x-y-1);
②原式=(a-b)(3a+b)2-(a+3b)2(a-b)
=(a-b)[(3a+b)2-(a+3b)2]
=(a-b)[(3a+b)+(a+3b)][(3a+b)-(a+3b)]
=(a-b)(4a+4b)(2a-2b)
=8(a-b)2(a+b).
(3)化简得:16x-7=41,
即16x=48
则x=3.
1 |
36 |
=-
3 |
4 |
②原式=-
8 |
5 |
1 |
2 |
=
16 |
5 |
(2)①原式=(x2+y2-2xy)-1=(x-y)2-1
=(x-y+1)(x-y-1);
②原式=(a-b)(3a+b)2-(a+3b)2(a-b)
=(a-b)[(3a+b)2-(a+3b)2]
=(a-b)[(3a+b)+(a+3b)][(3a+b)-(a+3b)]
=(a-b)(4a+4b)(2a-2b)
=8(a-b)2(a+b).
(3)化简得:16x-7=41,
即16x=48
则x=3.
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