Toán Lớp 8: Thực hiện các phép tính
a) x(3-x)+(x+1)(x-1)
b) (x+5)(x-3)-x(x+2)
c) (x-1)(x ²+x+1)+10
d) (5x ³y ²-20 $x^{4}$ +15x ²y ²) ÷5x ²y
e) (9xy ²-12x ²y ³):3xy ²+4xy
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Toán Lớp 8: Thực hiện các phép tính
a) x(3-x)+(x+1)(x-1)
b) (x+5)(x-3)-x(x+2)
c) (x-1)(x ²+x+1)+10
d) (5x ³y ²-20 $x^{4}$ +15x ²y ²) ÷5x ²y
e) (9xy ²-12x ²y ³):3xy ²+4xy
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