问俩道简单的数学计算题(0.5-0.2)乘以(0.2+0.5a²) (-3x+5y)乘以(-5y-3x)(-m²n+1)
1个回答
我来回答:1.原式=(0.5a²-0.2)(0.5a²+0.2)=0.25aˆ4-0.04
2.(-3x+5y)(-3x-5y)=9x²-25y²
3.(-m²n+1)(-m²n-1)=mˆ4n²-1
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