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`@` `\text {Ans}`
`\downarrow`
\(5\cdot19+5\cdot81\cdot10\)
`=`\(5\cdot\left(19+81\cdot10\right)\)
`=`\(5\cdot\left(19+810\right)\)
`=`\(5\cdot829\)
`= 4145`
____
\(37\cdot54+37\cdot45+37\)
`=`\(37\cdot\left(54+45+1\right)\)
`=`\(37\cdot100\)
`= 3700`
____
`7*32 + 14*34`
`= 7*2*16 + 7*2*34`
`= (7*2)*(16+34)`
`= 14*50`
`= 700`
5.19+5.81.10
=5.(19+81).10
=5.100.10
=500.10
=5000
xong:)
7.32=(1+2+4).25
=25.1+25.2+25.4
=25+26+27
Vậy ta có thể viết
7.25=25+26+27
a: \(=47-\left[\left(45\cdot16-25\cdot12\right):14\right]\)
\(=47-30=17\)
b: \(=50-\left[6+34\right]\)
=50-40
=10
= 107-{38+[7.32-24:6+2.3]}:12
= 107-{38+[224-4+6]}:12
= 107-{38+226}:12
= 107-264:12
= 107-22
= 85
a) 52 . 2 - 32 . 4 b) 58 . 75 + 58. 50 - 58 . 25
= 25 . 2 - 9 . 4 = 58 . ( 75 + 50 - 25 )
= 50 - 36 = 58 . 100
= 14 = 5800
\(a,=75+60-13=122\\ b,=250-25+40=265\\ c,=4+100-9=95\\ d,=45+80-27=98\\ e,=5^3-100=125-100=25\\ g,=5+5=10\)
\(107-\left\{38+\left[7.3^2-24:6+\left(9-7\right)^3\right]\right\}:15\)
\(=107-\left\{38+\left[7.3^2-24:6+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[7.3^2-4+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[63-4+2^3\right]\right\}:15\)
\(=107-\left\{38+\left[59+2^3\right]\right\}:15\)
\(=107-\left\{38+67\right\}:15\)
\(=107-105:15\)
\(=107-7\)
\(=100\)
107 – {38 + [7.32 – 24 : 6+(9 – 7)3]}:15
= 107 - {38+ [7.32 - 24 : 6 + 23 ]} : 15
= 107 - {38 + [ 7.9 - 24 : 6 + 8]} :15
= 107 - {38+[ 63 - 4 + 8]} : 15
= 107 - {38 + 67} : 15
= 107 - 105 : 15
= 107 - 7
= 100
17) 10 – [(82 – 48).5 + (23.10 + 8)] : 28 - 70
= 10 - [(64 - 48).5 + (8.10 +8)] : 28 - 70
= 10 - [16.5 + 88] : 28 - 70
= 10 - [80 + 88] : 28 - 70
= 10 - 168 : 28 - 70
= 10 - 6 - 1
= 3
nếu sai câu nào mong bạn thông cảm ^^
\(PT\Leftrightarrow4^{x-2}=7\cdot9+1=64\)
\(\Leftrightarrow4^{x-2}=4^3\)
\(\Leftrightarrow x-2=3\)
\(\Leftrightarrow x=5\)