计算:(1) ;(2)(y 2 ·y 3 )÷(y·y 4 );(3)27 2 ×9 8 ÷(-3) 18 ;(4)27

1个回答

  • 计算:

    (1)

    (2)(y 2·y 3)÷(y·y 4);

    (3)27 2×9 8÷(-3) 18

    (4)27 2n+1×3 5n÷ 81 2n-1

    (5)(x 4 2÷(x 2 2·x 2-x 2÷(-x 0)。

    (1)原式=

    (2)原式=y 5÷y 5=1;

    (3)原式=3 6×3 16÷(-3) 18=3 22÷3 18=3 4=81;

    (4)原式=3 3(2n+l)×3 5n÷3 4(2n-1)=3 6n+3×3 5n÷3 8n-4=3 6n+3+5n-8n+4=3 3n+7

    (5)原式=x 8÷x 4·x 2-x 2÷(-1)=x 8-4+2+x 2=x 6+x 2