Cau 1 Trong cac bieu thuc sau , bieu thuc nao khong phai la don thuc ? A.2(1+x) B.-x×y² C.2y(-xy) D.-2 Cau 2 Cho cac don thuc sau:-3x²y;1,2x²y;-5xy²;

Cau 1 Trong cac bieu thuc sau , bieu thuc nao khong phai la don thuc ?
A.2(1+x) B.-x×y² C.2y(-xy) D.-2
Cau 2 Cho cac don thuc sau:-3x²y;1,2x²y;-5xy²;1/2x²y;3/4(xy)²;x²y
So cac don thuc dong dang voi don thuc (-x²y)la
A.1 B.2 C.3 D.4
Cau 3 Bac cua don thuc A=-3x⁶(yz)²y³ la
A.10 B.11 C.12 D.13
Cau 4 Gia tri cua bieu thuc A=1/2x²y-xy khi x=1,y=-1 la:
A.½ B.-½ C.3/2 D.-3/2