用因式分解计算:68.3^2-31.7^2,201^2-52^2+253*851,3*656^2-3*201^2
3个回答
展开全部
68.3^2-31.7^2,
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*656^2-3*201^2
=3*(656+201)(656-201)
=3*857*455
=1169805
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*656^2-3*201^2
=3*(656+201)(656-201)
=3*857*455
=1169805
追问
最后一题输错了,是3*201^2-3*201^2
追答
3*201^2-3*201^2=0
展开全部
68.3^2-31.7^2,
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*201^2-3*201^2=3*201^2(1-1)=0
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*201^2-3*201^2=3*201^2(1-1)=0
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2012-10-12
展开全部
68.3^2-31.7^2,
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*201^2-3*201^2=0
=(68.3+31.7)*(68.3-31.7)
=100*36.6
=3660
201^2-52^2+253*851,
=(201+52)(201-52)+253*851
=253*149+253*851
=253*(149+851)
=253*1000
=253000
3*201^2-3*201^2=0
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