a, số hạng thứ 31 là 1

b,có 34 số 1 và 66 số 0

35

hi

là 3,8 nhân 3,8 nha bạn

chu vi hình chữ nhật là:

40*10=400(cm vuông)

Đáp số 400cm vuông

=18 giờ 12 phút

tick cho mình đi

Vận tốc của ô tô là:

20:0,5=40(km/h)

Đáp số 40km/h

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