1:bcbad

2( 1):& gt； =

(2):2 or 0

(3):3 3 7

(4): 10

(5): 8.6 times 10 cubic meter.

(6): 15

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1( 1): the square of algebraic expression -2, m, 2ab, a+b, x +2x+ 1

Single item -2, m, 2ab

Square of polynomial x +2x+ 1, a+b

(2):x squared, 2xy squared, and y squared is 3.

(3): (a+b) and (2a+4b) only

⑷:5(a+b)

(5): Sum of side lengths

(6): the square of A minus the square of π (half a)

Multiple choice questions are; d、c、a