问题
解答题
(1)(3xy2)-(-2xy)
(2)(-2)2-20100+2-2
(3)(2x2y)3-(-7xy2)÷(14x4y3)
答案
(1)原式=-6x2y3.
(2)原式=4-1+1 4
=3
;1 4
(3)原式=8x6y3•(-7xy2)÷(14x4y3)
=-56x7y5÷(14x4y3)
=-4x3y2.
(1)(3xy2)-(-2xy)
(2)(-2)2-20100+2-2
(3)(2x2y)3-(-7xy2)÷(14x4y3)
(1)原式=-6x2y3.
(2)原式=4-1+1 4
=3
;1 4
(3)原式=8x6y3•(-7xy2)÷(14x4y3)
=-56x7y5÷(14x4y3)
=-4x3y2.