Question

(3.4*4.8*9.5)-(1.9*1.7*2.4)怎样算最简便

Answer 1

(3.4*4.8*9.5)-(1.9*1.7*2.4)=[3.4*2.4*(2*9.5)]-(1.9*1.7*2.4)=(3.4*2.4*19)-(1.9*1.7*2.4)

=(3.4*2.4*19)-(1.9*1.7*2.4)

=(2.4*19)(3.4-0.24)

=[2.4*(20-1)]*3.16

=45.6*3.16=144.096