①: 3 times 40= 120 (km)

120 divided by 50=2.4 (hours)

answer ......

②: 3600 divided by (400+500)=4 (days)

answer ......

③: 9-3 = 6 (km)

6 times 2.4= 14.4 (yuan)

14.4+8=22.4 (yuan)

answer ......

④: [120 times (1-30%)] times 4=336 (person)

[80 times (1-30%)]2 times =56 (person)

(336+56) times 3= 1 176 (person)1500 > 1 176

A: No. ..

60 pages 1. +4.39 +4.8 *7.5 *4 *(b+c)

2.658 4455 90 24 2 five quarters 10

3.( 1)2857 14 (2) 100

42857 1 1 100

57 1428 1 1 100

7 14285 1 1 1 100

857 142 1 1 1 1 100

6 1 page1.456 6 5.0445147/216.

2.0.96 0.9625 0.9 0.93

3.( 163- 158)/ 158 = 0.032 (2) ( 1+5-40)/45 = 0. 1 1 (3 ( 163- 155)/ 155=0.025

Page 621.180-12 =168 4 * 26 =104168-104 = 6464/4

2. 1-0.7 1=0.29 5. 1*(0.7 1-0.29)=2. 142

3.( 1) 1- 1560/2400=0.35

(2) 2400-2400*0.35= 1560

(3) 1500/( 1-0.35)=2400