làm giúp mình nha 21.7\(^2\)-11.7\(^2\)+90.7\(^2\)+49.125.16
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\(21\cdot7^2-11\cdot7^2+90\cdot7^2+7^2\cdot125\cdot16\)
\(=7^2\left(21-11+90+2000\right)\)
\(=7^2\cdot2100\)
\(=102900\)
= 7 mũ 2 . ( 21 - 11 + 90 ) + 49.125.16
= 7 mũ 2 . 100 + 49.125.16
= 4900 + 49.125.16
= 4900 + 98000
= 102900
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
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
a,21.7^2-11.7^2+90.7^2+49.125.16
=7^2.(21-11+90)+49.(2.125.8)
=49.100+49.2000
=49.(100+2000)
=49.2100
=102900
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
a)
\(\Rightarrow35.\left(34+86\right)+65.\left(75+45\right)\)
\(\Rightarrow35.120+65.120\)
\(\Rightarrow120.\left(35+65\right)=120.100=12000\)
b)
\(\Leftrightarrow21.49-11.49+90.49+49.125.16\)
\(\Rightarrow49.\left(21-11+90+2000\right)\)
\(\Rightarrow49.2100=102900\)
a) 35 . 34 + 35 . 86 + 65 . 75 + 65 . 45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 45 )
= 35 . 120 + 65 . 120
= ( 35 + 65 ) . 120
= 100 . 120
= 12000
\(21.7^2-11.7^2+90.7^2+49.125.16\)
\(=49.\left(21-11+90+125.16\right)\)
\(=49.2100\)
\(=102900\)
`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`