问题 解答题

计算:(1)(6x2y3z22÷4x3y4

(2)(-8×1011)×(2×103)÷(0.4×105

(3)[xy(x2-2xy)-x2y(x-3y)]÷3x2y

答案

(1)(6x2y3z22÷4x3y4

=36x4y6z4÷4x3y4

=9xy2z4

(2)(-8×1011)×(2×103)÷(0.4×105),

=-16×1014÷(0.4×105),

=-4×1010

(3)[xy(x2-2xy)-x2y(x-3y)]÷3x2y,

=(x3y-2x2y2-x3y+3x2y2)÷3x2y,

=x2y2÷3x2y=

1
3
y.

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