0.8x²-1.2x²-0.1x²=-50?
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0.8x²-1.2x²-0.1x²=-50?
0.8x²-1.2x²-0.1x²=-50?
0.8x²-1.2x²-0.1x²=-50?
-0.5x²=-50
x²=100
x=10 或x=-10
当x=10时 0.8x²-1.2x²-0.1x²=
原式=-0.5x²
=-0.5×10²
=-50