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Có : 35 x 54 - 19 = 35 x 53 + 35 - 19 = 35 x 53 + 16
Mà 35 x 53 + 16 > 53 x 35 + 12
Vậy 35 x 54 - 19 > 53 x 35 + 12
Chúc bn hok tốt ạ ;33
d) ( 2 x + 1 ) 2 = 49
2x + 1 = 7 hoặc 2x + 1 = -7
2x = 6 hoặc 2x = -8
x = 3 hoặc x = -4
\(25x\left(35-47\right)-35x\left(25-47\right)\)
\(=5x5x\left(35-47\right)-5x7x\left(25-47\right)\)
\(=5x\left(175-235\right)-5x\left(175-329\right)\)
\(=5x\left(-60\right)-5x\left(-154\right)\)
\(=5x\left(-60+154\right)\)
\(=5x94=470\)
=-25*35+(-25)*147+35*25+35*147
=-25*35+35*25+(-25)*147+35*147
=147*(-25+35)
=147*10
=1470
-25x[35+147]+35x[25+147]
= [-25+25]x[35+35]+[147+147]
=0x70+294
=0+294
=294
4. ( x - 250 ) : 6 = 64 - 12
( x- 250 ) : 6 = 52
x - 250 = 312
x = 562
5. 10x = 1030
=> x = 103
6. 30x = 120
x = 4
7. \(x=2023\)
\(8.165-\left(35:x+3\right).19=13\)
\(\left(35:x+3\right).19=152\)
\(35:x+3=8\)
\(35:x=5\)
\(x=7\)
4) \(\left(x-250\right)\div6=4^3-2^2\times3\)
\(\left(x-250\right)\div6=64-4\times3\)
\(\left(x-250\right)\div6=64-12=52\)
\(x-250=52\times6=312\)
\(x=312+250\)
\(x=562\)
5) \(2x+3x+5x=1030\)
\(x\left(2+3+5\right)=1030\)
\(10x=1030\)
\(x=1030\div10\)
\(x=103\)
6) \(15x-35x+50x=120\)
\(x\left(15-35+50\right)=120\)
\(30x=120\)
\(x=120\div30\)
\(x=4\)
7) \(\dfrac{1}{2}x+\dfrac{1}{6}x+\dfrac{1}{3}x=2023\)
\(x\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}\right)=2023\)
\(x\times1=2023\)
\(x=2023\)
8) \(165-\left(35\div x+3\right)\times19=13\)
\(\left(35\div x+3\right)\times19=165-13\)
\(\left(35\div x+3\right)\times19=152\)
\(35\div x+3=152\div19=8\)
\(35\div x=8-3=5\)
\(x=35\div5\)
\(x=7\)
A=[-506+732-(2000)]-(506-1732)
A=[226+2000]-226
A=(226-226)+2000
A=2000
B=1037+{743-[1031-(+57)]}
B=1037+743-1031+57
B=(1037-1031)+(743+57).
B=6+800=806
C=(125.73-125.75):(-25.2)
C=125.(73-75):(-50)
C=125.(-2):(-50)
C=-250:(-50)=5
D=-25.(35+147)+35.(25+147)
D=-25.35+(-25).147+35.25+35.147
D=35(-25+25)+147(-25+35)
D=147.10=1470
E=125.9.(-4).(-8).25.7
E=125.9.4.8.25.7
E=(125.8).(25.4).(9.7)
E=1000.100.63
E=6300000