Bài 2.
a. 5.125.2.4 b. 25.50.4.20 c. 4.37.25 d. 39.4.5.5
=(5.2)(125.4) = (25.4)(50.20) = 37.(4.25) = 39 ( 4.5.5)
=10.5000 = 100. 1000 =37.100 = 39. 100
=5000 = 100000 = 3700 =3900
g. 25.5.4.2 i. 8.36.125 j. 7.4.50.25.2 k. 4.75.5.25.2 l. 5.89.20
= (25.4)(5.2) = 36 (8.125) = 7.(4.25)(50.2) = 75(4.25)(5.2) = 89( 5.20)
= 100.10 =36.1000 =7.100.100 = 75.100.10 =89.100
= 1000 = 36000 = 70000 = 75000 = 8900
m. 8.12.125.5 n. 5.5.50.4.20 o. 18.26.25.9 f. 25.64.4
= (8.125)(12.5) = (5.5.4)(50.20) = (18.25)(26.9) =. 64(25.4)
= 1000.60 = 100.1000 = 450.234 =64.100
= 60000 = 100000 = 105300 = 6400
Bài 3.
a. 17.32+43.17+17.25 b. 24.19+29.24+18.24+24.33+24 c. 17.36+17.64
= 17( 32+43+25) = 24( 19+29+18+33+1) = 17 ( 36+64)
= 17.100 = 24. 100 = 17.100
= 1700 = 2400 = 1700
d. 17.85+17.15+120 e. 32.47+32.53 f. 23.47+77.47 g. 37.99+37.41
= 17( 85+15)+120 = 32(47+53) = 47(23+77) = 37( 99+41)
= 17.100+120 = 32.100 = 47. 100 = 37. 140
= 1820 = 3200 = 4700 = 5180
h. 4.33+4.67+4.25
= 4( 33+67+25)
=4.125
= 500
vote 5* và ctlhn cho mk nhé. chúc bn học tốt
