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a) thay a = 119 ;b = 0 vào bt : ( 119 x a +2005 ) +119 :a- b x 2005 ta có :
( 119 x 199+2005) +119 :119 -0 x2005
<=> (14161+2005 ) +119 : 119 -0 x 2005
<=>16166+119 : 199 -0 x 2005
<=> 16166+1 - 0 x 2005
<=> 16166 +1 - 0
<=> 16167
b) 100 : {2 x [ 52-(25 - 8 )]}
<=> 100 : { 2 x [ 52 - 17] }
<=> 100 : { 2 x 35 }
<=> 100 : 70
<=> \(\frac{10}{7}\)
c) 12 : { 390 : [ 500 - ( 125 +25 : 7 ) ] }
<=> 12 : { 390 : [ 500 - ( \(\frac{900}{7}\) ) ] }
<=> 12 : { 390 : [ \(\frac{2600}{7}\) ] }
<=> 12 : { \(\frac{21}{20}\) }
<=> \(\frac{80}{7}\)
\(1) 420+65.4=(x+175):5+30\)
\(\implies 420+260=(x+175):5+30\)
\(\implies 680=(x+175):5+30\)
\(\implies 650=(x+175):5\)
\(\implies 650.5-175=x\)
\(\implies 3075=x\)
\(2)x-4867=(175.2050.70):25+23\)
\(\implies x-4867=1004500+23\)
\(\implies x-4867=1004523\)
\(\implies x=1009390\)
\(3) 134-[(96-7x):4-2]=126\)
\(\implies (96-7x):4-2=8\)
\(\implies(96-7x):4=10\)
\(\implies 96-7x=40\)
\(\implies 7x=56\)
\(\implies x=8\)
\(4) 4-\{100-[(100-5x):8-5]:10\}:25=0\)
\(\implies 4-\{100-[(100-5x):8-5]:10\}=0\)
\(\implies 100-[(100-5x):8-5]:10=4\)
\(\implies 100-[(100-5x):8-5]=40\)
\(\implies (100-5x):8-5=60\)
\(\implies (100-5x):8=65\)
\(\implies 100-5x=520\)
\(\implies 5x=-420\)
\(\implies x=-84\)
~ Hok tốt a~
\(a,97\times327+327\times3\)
\(=327\times\left(97+3\right)\)
\(=327\times100\)
\(=32700\)
\(b,\frac{1}{7}\times\frac{4}{23}+\frac{1}{7}\times\frac{25}{23}+\frac{1}{7}\times\frac{17}{23}+5\times\frac{1}{7}\)
\(=\frac{1}{7}\times\left(\frac{4}{23}+\frac{25}{23}+\frac{17}{23}+5\right)\)
\(=\frac{1}{7}\times7\)
\(=1\)
a) 97 x 327 + 327 x 3
= (97 + 3) x 327
= 100 x 327 = 32700
b) \(\frac{1}{7}\times\frac{4}{23}+\frac{1}{7}\times\frac{25}{23}+\frac{1}{7}\times\frac{17}{23}+5\times\frac{1}{7}\)
\(=\frac{1}{7}\times\left(\frac{4}{23}+\frac{25}{23}+\frac{17}{23}+5\right)\)
\(=\frac{1}{7}\times7=\frac{7}{7}=1\)
Vì 7 < X x 0,07 <14
=>X x 0,07 = 8 ; 9 ; 10 ; 11 ; 12 ; 13
X x 0,07 | 8 | 9 | 10 | 11 | 12 |
X | 114.285714286 | 128.571428571 | 142.857142857 | 157.142857143 | 171.428571429 |
Mình tính bằng máy tính nên ko sai đâu, hơi loằng ngoằng thôi!
Hok tốt!
a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)
Đến đây tự tính nha !
b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)
= 23 x 0.07 + 0.07 x 52 + 0.07 x 25
= ( 23 + 52 + 25 ) x 0.07
= ( 75 + 25 ) x 0.07
= 100 x 0.07
= 7
23 x 0,07 + 7% x 52 + 7/100 x 25
= 23 x 0,07 + 0,07 x 52 + 0,07 x 25
= 0,07 x (23 + 52 + 25)
= 0,07 x 100
= 7
Chúc bạn học tốt.
😁😁😁