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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: giúp mik hic bài 1: làm tính nhân a) 3x(5x^2-2x-1) b)(x^2+2xy-3)(-xy) c)1/2x^2y(2x^3-2/5xy^2-1) d)(-2x^2)(1-3x+4x^2) giúp mik nha mn

Toán Lớp 8: giúp mik hic
bài 1: làm tính nhân
a) 3x(5x^2-2x-1)
b)(x^2+2xy-3)(-xy)
c)1/2x^2y(2x^3-2/5xy^2-1)
d)(-2x^2)(1-3x+4x^2)
giúp mik nha mn

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222-9+11+12:2*14+14 = ? ( )