Question

分解因式：1.4^2×9-2.3^2×36

Answer 1

1.4^2×9-2.3^2×36

=(1.4*3-2.3*6)(1.4*3+2.3*6)

=(4.2-13.8)(4.2+13.8)

=-9.6*18

=-(10-0.4)*18

=-180+7.2

=172.8