Toán Lớp 8: rút gọn biểu thức:
-5x(x-5)+(x-3)(x²-7)
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Toán Lớp 8: rút gọn biểu thức:
-5x(x-5)+(x-3)(x²-7)
Comments ( 2 )
=-5x^2+25x+x^3-7x-3x^2+21
=(-5x^2-3x^2)+(25x-7x)+x^3+21
=-8x^2+18x+x^3+21