4. 1.5 (/)4 additive commutative law

4.27/24,26/1Multiplicative Distribution Law

1.25 8 Multiplicative Exchange and Multiplicative Combination

②( 1000+ 100+ 10+ 1)-(0. 1*(×)4)

1 1 1 1-0.4

1 1 10.6

497-29 1+37

206+37

243

6。 92-( 1 1/8+ 1 1/3)+3。 18

6.92+3. 18- 1

10. 1- 1

9. 1

9/ 1*36+6/5*36_ 18/ 17*36

4+30- 14

20

9/4*[0/75+0.25- 16/7]

9/4*[ 1- 16/7]

9/4* 16/9

4/ 1

1.32*8/5+2.68*8/5

( 1.32+2.68)*8/5

````

3 \1.75kg = 2750g

0.05 kg = 50 g

500+50 = 550g

2750/550=5 times

5* 198=990 yuan

4. 12.9-2.3*3=6 yuan

6/(2+3)= 1.2 yuan

1.2+2。 3=3.5 yuan.