88 + 2 - 15 = ?
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a/ \(259+(249)-401+12\)
\(=508-401+12\)
\(=107+12\)
\(=119\)
b/ \(60.(45-15)-45.(60-15) \)
\(=(60.45-60.15)-(45.60-45.15)\)
\(=(60.45-45.60)-(60.15-45.15)\)
\(=0-(60.15-45.15)\)
\(=0-15.(60-45)\)
\(=0-15.15\)
\(=0-225\)
\(=-225\)
c/ \((-79).(-88)+(-21).(-88)\)
\(=\left(-88\right).\left[\left(-79\right)+\left(-21\right)\right]\)
\(=\left(-88\right).\left(-100\right)\)
\(=8800\)
d/ (Chắc là đề sai nhưng mình vẫn làm giúp bạn)
\(\left\{\left[14\div2\right]+7\right\}\div2012+\left|-37\right|\)
\(=\left\{\left[14\div2\right]+7\right\}\div2012+37\)
\(=\left\{7+7\right\}\div2012+37\)
\(=14\div2012+37\)
\(=0,006+37\)
\(=37,006\)
56 x 33= 1848
88 x 88= 7744
97 x 45= 4365
46 x 33= 1518
67 x 43= 2881
30 x 15= 450
\(1,8^8+2^{20}=2^{24}+2^{20}=2^{20}\left(2^4+1\right)=2^{20}\cdot17⋮17\)
\(2,A=\left(2+2^2\right)+\left(2^3+2^4\right)+...+\left(2^{119}+2^{120}\right)\\ A=2\left(1+2\right)+2^3\left(1+2\right)+...+2^{119}\left(1+2\right)\\ A=3\left(2+2^3+...+2^{119}\right)⋮3\)
\(A=\left(2+2^2+2^3\right)+...+\left(2^{118}+2^{119}+2^{120}\right)\\ A=2\left(1+2+2^2\right)+...+2^{118}\left(1+2+2^2\right)\\ A=\left(1+2+2^2\right)\left(2+...+2^{118}\right)=7\left(2+...+2^{118}\right)⋮7\\ A=\left(2+2^2+2^3+2^4\right)+...+\left(2^{117}+2^{118}+2^{119}+2^{120}\right)\\ A=2\left(1+2+2^2+2^3\right)+...+2^{117}\left(1+2+2^2+2^3\right)\\ A=\left(1+2+2^2+2^3\right)\left(2+...+2^{117}\right)=15\left(2+...+2^{117}\right)⋮15\)
( 7.x - 15 ) : 3 = 2
7.x - 15 = 6
7.x = 6 + 15
7.x = 21
x = 3
không biết vì chưa học
88 - 3 ( 7 + x ) = 64
3 ( 7 + x ) = 88 - 64
3 ( 7 + x ) = 24
7 + x = 8
x = 1
(7.x -15):3=2
7.x-15=2.3
7.x-15=6
7.x=6+15
7.x=21
x=21:7
x=3
12.(x+37)=504
x+37=504:12
x+37=42
x=42-37
x=5
88-3(7+x)=64
3(7+x)=88-64
3(7+x)=24
7+x=24:3
7+x=8
x=8-7
x=1
dấu . là nhân nhé
a)88-3(7+x)=64
=>3(7+x)=88-64
=>3(7+x)=24
=>7+x=24:3
=>7+x=8
=>x=8-7=1
tick nha
88 + 2 -15 =
TL
= 75
88 + 2 - 15 = 75