2x²y-xy²+二分之一x²y-二分之三xy²+2x²y²,其中x=y=1【先化简,再计算】
有点把不准.求解.谢谢.【希望带步骤,我是要弄懂.不是抄作业】
人气:389 ℃ 时间:2019-08-20 09:04:58
解答
2x²y-xy²+二分之一x²y-二分之三xy²+2x²y²
=(2+½)x²y+(-1-3/2)xy²+2x²y²
=2.5x²y-2.5xy²+2x²y²
=2.5×1×1-2/5×1×1+2×1×1
=2
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