2.3大题,写到纸上,
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2.3大题,写到纸上,2.3大题,写到纸上, 2.3大题,写到纸上,1.=[(5x+3)+(5y-2)+(5z+5)]/3=[5(x+y+z)+(3-2+5)]/3=(5×18+6)/3=3
2.3大题,写到纸上,
2.3大题,写到纸上,
2.3大题,写到纸上,
1.=[(5x+3)+(5y-2)+(5z+5)]/3=[5(x+y+z)+(3-2+5)]/3=(5×18+6)/3=32;
2.=[(4km/h×3h)+(6km/h×2h)]/(3h+2h)=4.8km/h;
3.D(x)=[(3-5)²+(4-5)²+(5-5)²+(6-5)²+(7-5)²]/5=2.