Ответ:

1.2) 100%-80

20%-x

x=(20*80):100=16

4)100%-900

35%-x

x=35*900:100=350

6)100%-1000

75%-x

x=75*1000:100=750

2 .2)40%-40

100%-x

x=100*40:40=100

4)25%-43

100%-x

100*43:25=172

6)150%-27

100%-x

100*27:150=18

№ 173 1)

2. 20% от 80 = 16

80 : 100 * 20 = 0,8 * 20 = 16

4. 35% от 900 = 315

900 : 100 * 35 = 9 * 35 = 315

6. 75% от 1000 = 750

1000 : 100 * 75 = 10 * 75 = 750

№ 173 2)

2. 40% равно 40 = 100

40 : 40 * 100 = 1 * 100 = 100

4. 25% равно 43 = 172

43 : 25 * 100 = 1,72 * 100 = 172

6. 150% равно 27 = 18

27 : 150 * 100 = 0,18 * 100 = 18