78 x 64 - 2 x 42 x 39 + 78 mũ 2
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a: A=(-2023)*(-78)*41*(-64)
A có 3 số âm, 1 số dương
=>A<0
b: 3*x
Nếu x>0 thì 3x>0
Nếu x<0 thì 3x<0
c: Nếu x>0 thì (-7)x<0
Nếu x<0 thì (-7)x>0
d: (-1)^2023*(-2)^10=-1024<0
`@` `\text {Ans}`
`\downarrow`
`2023 \times 14 + 2023 \times 83+97`
`= 2023 \times (14+83) + 97`
`= 2023 \times 97 + 97`
`= 196231 +97`
`= 196328`
`78 \times 31+78 \times 24+78 \times 17+78 \times 22 \times 72`
`= 78 \times (31+24+17+22 \times 72)`
`= 78 \times (31+24+17+1584)`
`= 78 \times 1656`
`= 129168`
`371 \times 69+371 \times 14+629 \times 83`
`= 371 \times (69+14) + 629 \times 83`
`= 371 \times 83 + 629 \times 83`
`= 83 \times (371+629)`
`= 83 \times 1000`
`= 83000`
`91 \times 51+49 \times 163-49 \times 72`
`= 91 \times 51 + 49 \times (163-72)`
`= 91 \times 51+49 \times 91`
`= 91 \times (51+49)`
`= 91 \times 100`
`= 9100`
`3 \times 12 \times 17 + 4 \times 9 \times 81 + 2 \times 6 \times 6`
`= 9 \times 4 \times 17 + 4 \times 9 \times 81 + 4 \times 9 \times 2`
`= 9 \times 4 \times (17+81+2)`
`= 36 \times 100`
`= 3600`
`42 \times 17 + 58 \times 83 \times 42 \times 83 + 42 \times 83 + 17`
`= 17 \times (42+58) + 42 \times 83 \times (58 \times 83 +1)`
`= 17 \times 100 + 3486 \times 4815`
`= 1700 + 16785090`
`= 16786790`
39x[250+87]+64x[240+97]
=39x337+64x337
=(39+64)x337
=103x337
=34711
78x31+78x24+78x17-22x72
=78x(31+24+17)-22x72
=78x72-22x72
=(78-22)x72
=56x72
=4032
bn tính lại nha
39 x [ 250 + 87 ] + 64 x [ 240 + 97 ]
= 39 x 337 + 64 x 337
= 337 x ( 39 + 64 )
= 337 x 103
= 34711
bai tiep
78 x 31 + 78 x 24 +78 x 17 - 22
= 78 x ( 31 + 24 + 17 ) - 22 x 72
= 78 x 72 - 22 x 72
=72 x ( 72 - 22 )
= 72 x 50
= 3600
a) \(326-2x=78\Rightarrow2x=326-78=248\)
\(\Rightarrow x=248:2=124\)
b) \(42.5-\left(3x+6\right)=3^4\Rightarrow210-\left(3x+6\right)=81\)
\(\Rightarrow3x+6=210-81=129\Rightarrow3x=129-6=123\)
\(\Rightarrow x=123:3=41\)
a, 326 -2x =78
\(\Rightarrow\)2x=326-78=248
\(\Rightarrow\)x=248/2=124
b,\(42.5-\left(3x+6\right)=3^4\)
\(\Rightarrow\)\(210-3x-6=81\)
\(\Rightarrow\)3x=123
\(\Rightarrow\)x=123/3=41
c, \(4^x:64=4^{250}\)
\(\Rightarrow\)\(4^x:4^3=4^{250}\)
\(\Rightarrow\)x=253
d, \(30x+1+2+3+...+30=495\)
\(\Rightarrow\)\(30x+465=495\)
\(\Rightarrow\)\(x=1\)
a)3.52-64:23
=3.25-64:8
=75-8
=67
b)53.18+2.9.78-18.40
=18.(53+2.9.78-40)
=18..(53+1404-40)
=18.1417
=25506
c)78:{390:[410-(340+15.4)]}+20190
=78:{390:[410-(340+60)]}+1
=78:{390:[410-400]}+1
=78:{390:10}+1
=78:39+1
=2+1
=3
Cho mk 1 tk nha
b, 53.18+2.9.78-18.40
=53.18+18.78-18.40
=18.(53+78-40)
=18.91
=1638
\(=78\cdot64-78\cdot42+78\cdot78\)
\(=78\left(64-42+78\right)\)
\(=78\cdot100\)
\(=7800\)