a:21.7^2-10-(-7)^2+90.7^2+49.(-1)^2019
b(-2)^10.13+2^10.39/ 2^8.104
\(21.7^2-11.7^2+90.7^2+49.125.16\)
\(21\cdot7^2-11\cdot7^2+90\cdot7^2+7^2\cdot125\cdot16\)
\(=7^2\left(21-11+90+2000\right)\)
\(=7^2\cdot2100\)
\(=102900\)
= 7 mũ 2 . ( 21 - 11 + 90 ) + 49.125.16
= 7 mũ 2 . 100 + 49.125.16
= 4900 + 49.125.16
= 4900 + 98000
= 102900
làm giúp mình nha 21.7\(^2\)-11.7\(^2\)+90.7\(^2\)+49.125.16
\(21.7^2-11.7^2+90.7^2+49.125.16\)
\(=49.\left(21-11+90+125.16\right)\)
\(=49.2100\)
\(=102900\)
`21.7^2 -11.7^2 +90.7^2 +49.125.16`
`=7^2(21-11+90)+49.25.5.4.4`
`=7^2 .100+100.49.20`
`=49.100+100.49.20`
`=49.100(1+20)`
`=49.100.21`
`=102900`
21.72−11.72+90.72+49.125.16= 21.49-11.49+90.49+49.125.16
=49.(21−11+90+125.16)
=102900
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
2^10.13+2^10.65
2^8.104
210.13 + 210.65 = 210(13 + 65) = 210.78
28.104 = 28(26 + 25 + 23) = 214 + 213 + 211
Tính nhanh
21.72-11.72+90.72+49.125.16
Tính nhanh:
21.72-11.72+90.72+49.125.16
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
tìm x
{ 2x-.1}^3+1=28
2^.2^3 mũ 2 = [ 25] ^2
x+2x+3x+...+9x=459-3^2
{ x-1}^2+1 = 26
tính
21.7^2-11.7^2+90.7^2
{225-7^2}{225-8^2}{225-9^2}....{225-20^2}
giúp minh vs mình đang cần gấp
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
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