12.2的平方*9-1.33的平方*4利用分解因式算
问题描述：
12.2的平方*9-1.33的平方*4
利用分解因式算
答
12.2^2*9-1.33^2*4
=9*12.2^2-4*1.33^2
=(3*12.2-2*1.33)(3*12.2+2*1.33)
=(36.6-2.66)(36.6+2.66)
=33.94*39.26
=4*(16.97*19.63)
=4*333.1211
=1332.4844
答
12.2^2*9-1.33^2*4
=12.2^2*3^2-1.33^2*2^2
=(12.2*3)^2-(1.33*2)^2
=36.6^2-2.66^2
=(36.6-2.66)*(36.6+2.66)
=33.94*39.26
=1332.4844
答
12.2的平方*9-1.33的平方*4
=12.2^2*3^2-1.33^2*2^2
=(3*12.2+1.33*2)(3*12.2-1.33*2)
=(36.6+2.66)(36.6-2.66)
=39.26*33.94
=1332.4844
12.2的平方*9-13.3的平方*4
=12.2^2*3^2-13.3^2*2^2
=(3*12.2+13.3*2)(3*12.2-13.3*2)
=(36.6+26.6)(36.6-26.6)
=63.2*10
=632
1.22的平方*9-1.33的平方*4
=1.22^2*3^2-1.33^2*2^2
=(3*1.22+13.3*2)(3*1.22-1.33*2)
=(3.66+2.66)(3.66-2.66)
=6.32*1
=6.32