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\(a,4^8.2^{20}=\left(2^2\right)^8.2^{20}=2^{16}.2^{20}=2^{16+20}=2^{36}\\ b,9^{12}.27^5.81^4=\left(3^2\right)^{12}.\left(3^3\right)^5.\left(3^4\right)^4=3^{24}.3^{15}.3^{16}=3^{24+15+16}=3^{55}\\ d,25^{20}.125^4=\left(5^2\right)^{20}.\left(5^3\right)^4=5^{40}.5^{12}=5^{40+12}=5^{52}\\ d,x^7.x^4.x^3=x^{7+4+3}=x^{14}\)
a: 4*8*2^20=2^2*2^3*2^20=2^25
b: 9^12*27^5*81^4=3^24*3^15*3^16=3^55
c: 25^20*125^4=5^40*5^12=5^52
d: =x^(7+4+3)=x^14
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(2\cdot A=2^2+2^3+...+2^{101}\)
\(\Leftrightarrow A=2^{101}-2\)
Đặt \(A=2+2^2+...+2^{100}\)
\(2A=2^2+2^3+...+2^{101}\\ 2A-A=\left(2^2+2^3+...+2^{101}\right)-\left(2+2^2+...+2^{100}\right)\\ A=2^{101}-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-\left(-220\right)-78-220-\left(-78\right)-23=220-78-220+78-23\)
\(=\left(220-220\right)+\left(-78+78\right)-23\)
\(=0-23\)
\(=-23\)
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41 + 42 + 43 + 44 - 21 - 22 - 23 - 24
= (41 - 21) + (42 - 22) + (43 - 23) + (44 - 24)
= 20 + 20 + 20 + 20
= 20 x 4
= 80
tk nha. chúc bn học giỏi :)
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\(13.\left(23+22\right)-3.\left(17+28\right)\)
\(=13.23+22-3.17+28\)
\(=13.\left(23+17\right)-3\left(22+28\right)\)
\(=13.40-3.50\)
\(=520-150=370\)
\(-48+48.\left(-78\right)+48.\left(-21\right)\)
\(=48.\left[-78+\left(-21\right)-1\right]\)
\(=48.\left(-100\right)=-4800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
1. -86 + ( -14)
= -86 - 14
= -100
2. 123 + ( -36)
= 123 - 36
= 87
3. ( -44) - ( -66)
= -44 + 66
= 22
4. -82 + (-28)
= -82 - 28
= -110
5. 83 + ( -17)
= 83 - 17
= 66
Các bài khác làm tương tự nha bạn
1/ (-86)+(-14)=-86-14=-100
2/123+(-36)=123-36=87
3/(-44)-(-66)=-44+66=22
4/-82+(-28)=-82-28=-110
5/83+(-17)=83-17=66
6/(-83)-33=(-83)+(-33)=-116
7/ 73+(-24)=73-24=49
8/84+(-48)=84-48=36
9/-72-82=-72+(-82)=-154
10/-97-82=-97+(-82)=-179
11/19+(-92)=19-92=-73
12/38-28=10
13/13+(-27)=13-27=-14
14/-85+29=-85-(-29)=-114
15/-84-(-27)=-84+27=-57
16/-23+78=-23-(-78)=-101
17/93+(-29)=93-29=64
18/-74-83=-74+(-83)=-157
19/-183+83=-183-(-83)=-266
20/849-(-3832)=849+3832=4681
Có gì sai mong bạn sửa giúp mình nhé!