Tính:
-261:9+75:73-(-4)2.5
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Đặt tính rồi tính:
486 + 303= 789
670 – 261 = 409
106 x 9 = 954
872 : 4 = 218
C =[125.(73-75)]:(-25)2
=125.(-2):(-25).2
=-250:(-50)
=5
E=125.9.(-4).(-8).25.7
=125.(-8).25.(-4).7.9
=-1000.(-100).63
=6300000
C = ( 125 . 73 - 125 . 75 ) : ( -50)
C = 125 .( -2 ) : (-50)
C = -250 : -50
C = 50
G = ( -3 )2+( -5)3: l -5 l
G = 9 + ( -125) : 5
G = 9 + ( -25 )
G= ( -16 )
E = 125 .9.*( -4 ) . ( -8) .25.7
E = 25.5 .( -4 ) .9 .2. ( -4 ) .25 .7
E =( -100 ).10.( -100).63
E = 10000.630
E = 630000
**** mha
\(\dfrac{45^{10}\cdot5^{20}}{75^{15}}=\dfrac{\left(3^2\cdot5\right)^{10}\cdot5^{20}}{\left(3\cdot5^2\right)^{15}}=\dfrac{3^{20}\cdot5^{10}\cdot5^{20}}{3^{15}\cdot5^{30}}=3^5=243\\ \dfrac{6^6+6^3+3^3+3^6}{-73}=\dfrac{46656+216+27+729}{-73}=-\dfrac{47628}{73}\\ \dfrac{27^7+3^{15}}{9^9-27}=\dfrac{\left(3^3\right)^7+3^{15}}{\left(3^2\right)^9-3^3}=\dfrac{3^{21}+3^{15}}{3^{18}-3^3}=\dfrac{3^{15}\left(3^6+1\right)}{3^3\left(3^{15}-1\right)}=\dfrac{3^5\cdot730}{3^{15}-1}\\ \dfrac{8^{20}+4^{20}}{4^{25}+64^5}=\dfrac{\left(2^3\right)^{20}+\left(2^2\right)^{20}}{\left(2^2\right)^{25}+\left(2^6\right)^5}=\dfrac{2^{60}+2^{40}}{2^{50}+2^{30}}=\dfrac{2^{40}\left(2^{20}+1\right)}{2^{30}\left(2^{20}+1\right)}=2^{10}=1024\)
\(A=7^5:7^3+2\cdot3^2\)
\(A=7^{5-3}+2\cdot9\)
\(A=7^2+18\)
\(A=49+18\)
\(A=67\)
86-84+82-80+...+8-6+4-2
=2+2+2+...+2+2+2 (có tất cả 21 số 2)
=2.21
=42
77-75+73-71+...+7-5+3-1
= 2 + 2 + ... + 2 ( có 38 số 2)
= 2 . 38
= 76
tick đúng cho mình nhé !
\(a.\)\(10x+2^2.5=10\)
\(\Leftrightarrow10x+4.5=10\)
\(\Leftrightarrow10x+20=10\)
\(\Leftrightarrow10x=10-20\)
\(\Leftrightarrow10x=-10\)
\(\Leftrightarrow x=-10:10\)
\(\Leftrightarrow x=-1\)
\(b.\)\(125-5\left(4+x\right)=15\)
\(\Leftrightarrow5\left(4+x\right)=125-15\)
\(\Leftrightarrow5\left(4+x\right)=110\)
\(\Leftrightarrow4+x=110:5\)
\(\Leftrightarrow4+x=22\)
\(\Leftrightarrow x=22-4\)
\(\Leftrightarrow x=18\)
\(c.\)\(2^6+\left(218-x\right)=73\)
\(\Leftrightarrow64+\left(218-x\right)=73\)
\(\Leftrightarrow218-x=73-64\)
\(\Leftrightarrow218-x=9\)
\(\Leftrightarrow x=218-9\)
\(\Leftrightarrow x=209\)
-261:9+75:73-(-4)2.5
= (-29) + 72 + 42 . 5
= (-29) + 49 + 16 . 5
= 20 + 80
= 100
Hok tốt !
-261:9+75:73-(-4)2.5
=-261:9+72+16.5
=-29+49+80
=20+80
=100