Mathematics
Junior High
Solved
教えてください教えてくれた方フォローします
=5x+14y
DX 11.-4(-2x²-x+1)-(x²-2x-9) (-+ a
8x²+x-4-x²+2x+9
=8x²-x²+x+2x-4+9
= 17x² + 3x +5
7x²76x15
=
+
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