Question

递等试1234

Answer 1

2.9x1.4+2x0.16

=7.26

追答

2.9x1.4+2x0.16
=(2+0.9)x(2-0.6)+2x0.16
=2x2-2x0.6+2x0.9-0.9x0.6+2x0.16
=2x(2-0.6+0.9+0.16)+0.9x0.6
=4.92+0.54
=5.46

200-(3.05+7.1)x18
=200-10.15x18
=200-(10+0.15)x18
=200-180-0.15x(10+8)
=20-1.5-1.2
=17.3

30.8/[14-(9.85+1.07)]
=30.8/[14-10.92]
=30.8/3.08
=10

(2.44-1.8)/0.4x20
=0.64/0.4x20
=1.6x20
=32
不好意思，时间太紧了，来不及算，现在补充给你，多给点财富值呀

2.9x1.4+2x0.16
=(2+0.9)x(2-0.6)+2x0.16
=2x2-2x0.6+2x0.9-0.9x0.6+2x0.16
=2x(2-0.6+0.9+0.16)-0.9x0.6
=4.92-0.54
=4.38
不好意思有个减号被我写成加号了