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= 6xy^2
B. 2ab^2 + 3b^2a - b^2a + 4ab^2
= 8ab^2
C. 6r^2st + 3rts - 5tsr^2
= r^st + 3rts
= 4xy² + 2xy²
= 6xy^2
B. 2ab² + 3b²a - b²a + 4ab²
= 2ab² + 4ab² + 3b²a - b²a
= 6ab² + 2b²a
= 8ab²
C. 6r²st + 3rts - 5tsr²
= 6r²st - 5tsr² + 3rts
= r²st + 3rts