24:4=?
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
b.
$B=-(a-c)-(a-b+c)=-a+c-a+b-c=(-a-a)+(c-c)+b=-2a+0+b=-2a+b$
c.
$C=-(15-x)+5=-15+x+5=(-15+5)+x=-10+x$
d.
$D=[a+(a+3)]-[(a+2)-(a-2)]$
$=(2a+3)-(a+2-a+2)=(2a+3)-4=2a+3-4=2a-1$
![](https://rs.olm.vn/images/avt/0.png?1311)
24 x 4 + 24 x 5 + 24
=24 x (4 + 5) + 24
=24 x 9 + 24
=216 + 24
=240
![](https://rs.olm.vn/images/avt/0.png?1311)
mong cac ban tra loi chu minh cung muon tim ket qua cua cau nay lam
![](https://rs.olm.vn/images/avt/0.png?1311)
24(15-4)+4(24-15)
=24*15-24*4+4*24-4*15
=24*15-4*15=15(24-4)=15*20=300
![](https://rs.olm.vn/images/avt/0.png?1311)
1.
$(5^{1986}-5^{1985}):5^{1985}=5^{1985}(5-1):5^{1985}=5-1=4$
2.
\((7^{846}+7^{847}):7^{846}=7^{846}(1+7):7^{846}=1+7=8\)
3.
\((9^{2018}-3^{4036}):6^{2006}=[(3^2)^{2018}-3^{4036}]:6^{2006}\)
$=(3^{4036}-3^{4036}):6^{2006}=0:6^{2006}=0$
4.
$(7^{80}.8^{70}-56^{70}):56^{70}$
$=[7^{10}(7.8)^{70}-56^{70}]:56^{70}$
$=[7^{10}.56^{70}-56^{70}]:56^{70}$
$=56^{70}(7^{10}-1):56^{70}=7^{10}-1$
5.
$4^{4016}:(4^{4017}-4^{4016})=4^{4016}:[4^{4016}(4-1)]$
$=4^{4016}:4^{4016}:3=1:3=\frac{1}{3}$
6.
$(12^{206}.2^{207}-24^{206}):24^{206}$
$=(12^{206}.2^{206}.2-24^{206}):24^{206}$
$=[(12.2)^{206}.2-24^{206}]:24^{206}$
$=(24^{206}.2-24^{206}):24^{206}$
$=24^{206}(2-1):24^{206}=2-1=1$
7.
$(5^2-24)^{8946}+4^{30}:2^{60}=1^{8946}+(2^2)^{30}:2^{60}$
$=1+2^{60}:2^{60}=1+1=2$
8.
$(37.8^{1007}-7.2^{3021}):8^{1007}=[37.8^{1007}-7.(2^3)^{1007}]:8^{1007}$
$=[37.8^{1007}-7.8^{1007}]:8^{1007}$
$=8^{1007}(37-7):8^{1007}=37-7=30$
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:\(24.\left(15-4\right)+4.\left(24-15\right)\)
\(=24.15-24.4+4.24-15.4\)\(=24.15-15.4\)
\(=15.\left(24-4\right)\)
\(=15.20=300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
\(\left(24-\frac{12}{3}\right)x4\)
= \(\left(\frac{72}{3}-\frac{12}{3}\right)x4\)
= \(\frac{60}{3}x4\)
= \(20x4\)
= \(80\)
\(24-\frac{12}{3}x4\)
= \(24-\frac{48}{3}\)
= \(24-16\)
= \(8\)
# Chúc bạn học tốt #
24:4=6
24 : 4 = 6
ĐS: 6