Tính nhanh:
49.125.16
tính nhanh : 21.72-11.72+90.72+49.125.16
21.72-11.72+90.72+49.125.16
=21.49-11.49+90.49+49.2000
=(21-11+90+2000).49
=2100.49
=102900
21.72-11.72+90.72+49.125.16
=21.49-11.49+90.49+49.2000
=(21-11+90+2000).49
=2100.49
=102900
Tính nhanh
21.72-11.72+90.72+49.125.16
Tính nhanh:
21.72-11.72+90.72+49.125.16
tính nhanh
21.72-11.72+90.72+49.125.16
21.72-11.72+90.72+49.125.16
=21.72-11.72+90.72+72.2000
=(21-11+90+2000).72
=2100.49
=102900
Tính nhanh
21.72_11.72+9o.72+49.125.16
TÍNH NHANH
a, 35.34+35.86+65.75+65.45
b, 21.72-11.72+90.72+49.125.16
A,35*34+35*86+65*75+65*45
=35*[34+86]+65*[75+45]
=35*100+65*120
=35*100+65*100+65*20
=[35+65]*100+65*20
=10000+1300=11300
Tính nhanh
a, 35.34+35.86+65.75+65.45
b, 21.72-11.72+90+72+49.125.16
a) 35× 34 +35× 86 + 65 × 75 + 65× 45
= 35× ( 34+86) + 65× (75 + 45)
= 35× 120 + 65 × 120
= 120 × ( 35 + 65)
= 120 × 100 = 12000
Câu 2: Tính nhanh
a) 35.34+35.86+65.75+65.45
b) 21.72 - 11.72+90.72+49.125.16
Help me!!!
a) 35.34 + 35.86 + 65.75 + 65.45
= 35. ( 34 + 86 ) + 65 . ( 75 + 25 )
= 35 . 120 + 65 . 100
= 4200 + 6500
= 10700
b) 21.49 - 11.49 + 90.49 + 49.125.16
= 49 . ( 21-11+90) +49 .125.8.2
= 49 .100 + 49 .1000 .2
= 4900 + 49000 .2
= 4900 + 98000
= 102900
Hên xui nhé !!!
Bạn Bích Trâm sai đề bài câu a rùi
Đáp án đúg là 12480
35.34+35.86+65.75+65.45=35.(34+86)+65.(75+45)=35.120+65.120=100.120=12000
1,tính nhanh : 21.72 - 11.72+90.72+49.125.16
2, tìm x : (5x - 1).3 - 2 = 70
ko ghi đề nha
1,= \(7^2.\left(21-11+90\right)+49.125.16\)
= 49.100+49.100.20
= 4900.21
= 102900
2, (5^x-1).3=72
5^x-1=24
5^x=25=5^2
x=2