用平方差公式计算:1.10.3*9.7 2.(2m+n-p)(2m-n+p)
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用平方差公式计算:1.10.3*9.7 2.(2m+n-p)(2m-n+p)
1.10.3*9.7
=(10+0.3)(10-0.3)
=10*10-0.3*0.3
=100-0.09
=99.91
2.(2m+n-p)(2m-n+p)
=2m*2m-(n-p)(n-p)
=4m²-n²-p²+2np
用平方差公式计算:1.10.3*9.7 2.(2m+n-p)(2m-n+p)
1.10.3*9.7
=(10+0.3)(10-0.3)
=10*10-0.3*0.3
=100-0.09
=99.91
2.(2m+n-p)(2m-n+p)
=2m*2m-(n-p)(n-p)
=4m²-n²-p²+2np