-3.14*35.2+3.14*46.6+18.2*3.14-29.6*3.14

-3.14*35.2+3.14*46.6+18.2*3.14-29.6*3.14
=3.14*(-35.2+46.6+18.2-29.6)
=3.14*(17-17)
=0

你敢不敢把3.14提出来，3.14*（-35.2+46.6+18.2-29.6）=0

= 3.14 * (-35.2+46.6+18.2-29.6)
= 3.14 * [(18.2-35.2) + (46.6-29.6)]
= 3.14 * (-17 + 17) = 3.14 * 0 = 0