165:[375-(135.12^0+37.5)] giúp tui với mấy bạn ơi ghi lời giải giúp tui nha
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`3 3/4=3+3/4=12/4+3/4=15/4`
Tỉ số `%` của `3 3 /4` là: `15/4 xx100%=375%`
`->C`

1.
a) \(125+80+375+220\)
\(=\left(125+375\right)+\left(80+220\right)\)
\(=500+300\)
\(=800\)
b) \(25.11.8.4.125\)
\(=\left(25.4\right).\left(8.125\right).11\)
\(=100.1000.11\)
\(=1100000\)
c) \(18.74+18.27-18\)
\(=18.\left(74+27-1\right)\)
\(=18.100\)
\(=1800\)
d) \(75.23+75.77-500\)
\(=75.\left(23+77\right)-500\)
\(=75.100-500\)
\(=7500-500\)
\(=7000\)
e) \(150:\left[25.\left(18-4^2\right)\right]\)
\(=150:\left[25.\left(18-16\right)\right]\)
\(=150:\left[25.2\right]\)
\(=150:50\)
\(=3\)
f) \(125.23.2.8.50\)
\(=\left(125.8\right).\left(2.50\right).23\)
\(=1000.100.23\)
\(=2300000\)
g) \(235+88+165+12\)
\(=\left(235+165\right)+\left(88+12\right)\)
\(=400+100\)
\(=500\)
h) \(71.32+71.68-1100\)
\(=71.\left(32+68\right)-1100\)
\(=71.100-1100\)
\(=7100-1100\)
\(=6000\)
i) \(6^7:6^6+4^3.2-24^0\)
\(=6+64.2-1\)
\(=6+128-1\)
\(=133\)
j) \(546-6.\left[158:\left(30+7^2\right)\right]\)
\(=546-6.\left[158:\left(30+49\right)\right]\)
\(=546-6.\left[158:79\right]\)
\(=546-6.2\)
\(=546-12\)
\(=534\)
k) \(268+147+132+253\)
\(=\left(268+132\right)+\left(147+253\right)\)
\(=400+400\)
\(=800\)
2.
a) \(7x=707\)
\(x=707:7\)
\(x=101\)
b) \(6x+5=47\)
\(6x=47-5\)
\(6x=42\)
\(x=42:6\)
\(x=7\)
c) \(35:\left(x+1\right)=7\)
\(x+1=35:7\)
\(x+1=5\)
\(x=5-1\)
\(x=4\)
d) \(12+\left(29-3x\right)=35\)
\(29-3x=35-12\)
\(29-3x=23\)
\(3x=29-23\)
\(3x=6\)
\(x=6:3\)
\(x=2\)
e) \(2.4^x+10^1=138\)
\(2.4^x=138-10\)
\(2.4^x=128\)
\(4^x=128:2\)
\(4^x=64=4^3\)
\(\Rightarrow x=3\)
f) \(7x=140\)
\(x=140:7\)
\(x=20\)
g) \(7\left(15-x\right)+14=84\)
\(7\left(15-x\right)=84-14\)
\(7\left(15-x\right)=70\)
\(15-x=70:7\)
\(15-x=10\)
\(x=15-10\)
\(x=5\)
h) \(3^x.5-15=390\)
\(3^x.5=390+15\)
\(3^x.5=405\)
\(3^x=405:5\)
\(3^x=81=3^4\)
\(\Rightarrow x=4\)

375 *12+375+375*78
=375*(12+78)+375
=375*90+375
=375*90+375*1
=375*(90+1)
=375*91
=34125

TL:
a) 375 x 25 + 375 x 74 + 375
= 375 x 25 + 375 x 74 + 375 x 1
= 375 x (25 + 74 + 1)
= 375 x 100
= 37500
b) 2 x 250 x 50 x 8
= (2 x 50) x (250 x 8)
= 100 x 2000
= 200000
##học tốt##
a) 375x25+375x74+375x1
=375x(25+74+1)
=375x100
=37500
b)2x250x50x8
=(2x50)x(250x8)
=100x2000
=200000

41.29 + 41.70 + 41
= 41.(29 + 70 + 1)
= 41. { (29+1) + 70}
= 41.(30 + 70)
= 41.100
= 4100
= 37.(72 - 5 + 33)
=37.{ (72 + 33) - 5}
= 37. (105 - 5)
= 37. 100
= 3700


165: [ 375 - (135.12\(^0\) + 37.5]
= 165 : [375 - {135.1 + 185]
= 165 : [375 - {135 + 185}
= 165: [375 - 320]
= 165: 55
= 3
dạ em cảm ơn cô