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t, 238 : 236 + 51 . 32 - 72
= 22 + 45 - 49
=0
u. 791 : 789 + 5.52 - 124
= 72 + 125 -124
=50
=
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a)4.15 + 28:7 - 620:618
= 60 + 4 - 62
= 60 + 4 - 36
= 28
b)(32+23.5) : 7
= (9+ 8.5):7
=(9+ 40):7
=49 : 7
=7
c)1125:1123-35:(110+23)-60
= 112 - 243 : (1+8)-60
= 121 -243 : 9 - 60
= 121 - 27 - 60
= 34
d)520:(515.6+515.19)
= 520:(515.(6+19)
= 520 : 515 . 25
= 55.25
= 3125.25
=78125
e)718: 716+22.23
= 72+ 25
= 49 + 32
= 81
f) 59.73 - 302+27.59
= 59.(73+27)-302
= 59.100- 900
= 5900 - 900
= 5000
Trần Tuyết Tâm
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c)ta thấy 125*5^12=(5^3)*(5^12)=5^15 , =>124*5^12 <5^15
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k) \(2x-49=5.3^2\)
\(2x-49=45\)
\(2x=49+45\)
\(2x=94\)
\(x=47\)
l) \(3^2.\left(x+14\right)-5^2=5.2^2\)
\(9.\left(x+14\right)-25=20\)
\(9.\left(x+14\right)=45\)
\(x+14=5\)
\(x=-9\)
m) \(6x+x=5^{11}:5^9+3^1\)
\(7x=5^{11-9}+3\)
\(7x=5^2+3\)
\(7x=28\)
\(x=4\)
n) \(7x-x=5^{21}:5^{19}+3.2^2-\left(-7^{-0}\right)\)
\(6x=5^{21-19}+12-1\)
\(6x=5^2+11\)
\(6x=36\)
\(x=6\)
o) \(7x-2x=6^{17}:6^{15}+44:11\)
\(5x=6^{17-15}+4\)
\(5x=6^2+4\)
\(5x=40\)
\(x=8\)
o)7x-x=521:519+3.22-70
=> 6x = 5^2 + 12 -1
=> 6x = 36
=> x = 36/6 = 6
Kết quả 6
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