Cho x1(n)= r(n). rect4(n-1); x2(n)= 2n[u(n)-u(n-3)]. Tính x(n)= x1(n)*x2(n)

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

explanation:

step-by-step explanation:

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