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\(A=\dfrac{5.\left(2^2.3^2\right)^9.\left(2^2\right)^6-2.\left(2^2.3\right)^{14}.3^4}{5.2^{28}.3^{18}-7.2^{29}.3^{18}}\)
\(=\dfrac{5.2^{18}.3^{18}.2^{12}-2.2^{28}.3^{14}.3^4}{5.2^{28}.3^{18}-7.2^{29}.3^{18}}\)
\(=\dfrac{5.2^{20}.3^{18}-2^{29}.3^{18}}{2^{28}.3^{18}\left(5-7.2\right)}\)
\(=\dfrac{2^{29}.3^{18}\left(5.2-1\right)}{2^{28}.3^{18}\left(5-14\right)}=\dfrac{2.9}{-9}=-2\)
\(=\left(-80\right):\left\{51-\left[18-\left(24-5\right)\right]\right\}\)\(=\left(-80\right):\left\{51-\left[18-\left(24-5\right)\right]\right\}\)
\(=\left(-80\right):\left\{51-\left[18-19\right]\right\}\)
\(=\left(-80\right):\left\{51-\left(-1\right)\right\}\)
\(=\left(-80\right):52\)
\(=\frac{80}{52}\)
\(=\frac{20}{13}\)
\(----Have.A.Nice.Day.!!!----\)
a: =6^2-15*2
=36-30=6
b: =3*25+15*4-3
=72+60
=132
c: =25*2+5
=50+5
=55
d: =5+12=17
e: =7^2(15-5)=49*10=490
f: =4^3*125-125:25
=1000-5
=995
18 : 3 + 182 + 3 ( 51 : 17 )
= 6 + 182 + 3 . 3
= 188 + 9
= 197
=))
\(18:3+182+3\left(51:17\right)\)
\(=6+182+3.3\)
\(=6+182+9\)
\(=197\)
Chúc bạn học tốt!
a) 128 + 43 + 72 + 57
= ( 128 + 72 ) + ( 43 + 57 )
= 200 + 100
= 300
b) 41 . 51 + 49 . 51
= 51 . ( 41 + 49 )
= 51 . 90
= 4590
=
\(a,\) \(128+43+72+57\)
\(=\left(128+72\right)+\left(43+57\right)\)
\(=200+100\)
\(=300\)
\(b,\) \(41.51+49.51=51.\left(41+49\right)=51.90=4590\)
\(c,\) \(4^7:4^5=4^{7-5}=4^2=16\)
\(d,\) \(2.\left(5.4^2-18\right)\)
\(=2.\left(5.2^4-2.3^2\right)\)
\(=2.2.\left(5.2^3-3^2\right)\)
\(=4.\left(40-9\right)\)
\(=4.31=123\)
a) 12 : { 400 : [ 500 - ( 125 + 25 . 7 )]}
= 12 : { 400 : [ 500 - ( 125 + 175 )]}
= 12 : { 400 : [ 500 - 300 ]}
= 12 : { 400 : 200 }
= 12 : 2
= 6
b) 5 . 22 - 18 : 3
= 110 - 6
= 104
c) 18 : 3 + 182 + 3 . ( 51 : 17 )
= 6 + 182 + 3.3
= 6 + 182 + 9
= 197
d) 25.8 - 12.5 + 170 : 17 - 8
= 1000 - 60 + 10 - 8
= 940 + 10 - 8
= 940 + 2
= 942
Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
a: \(\left(-5\right)\cdot4=-5\cdot4=-20\)
b: \(6\cdot\left(-7\right)=-6\cdot7=-42\)
c: \(\left(-14\right)\cdot20=-14\cdot20=-280\)
d: \(51\cdot\left(-10\right)=-51\cdot10=-510\)
Bằng 2 nha bạn
80 : {51 - [18 - (22 . 3 - 5)]}
= 80 : {51 - [18 - 7]}
= 80 : {51 - 11}
= 80 : 40
= 2