Tính giá trị biểu thức: 73942 + 343 : 7
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(C=\left[-45^{10}.\left(-5\right)^{10}\right]:75^{10}\)
\(C=\left(-45^{10}.5^{10}\right):75^{10}\)
\(C=\left(-45.5\right)^{10}:75^{10}\)
\(C=\left(-225\right)^{10}:75^{10}\)
\(C=\left(-225:75\right)^{10}=\left(-3\right)^{10}=3^{10}\)
\(B=\left(7^4-7^3\right)^3:343^{12}\)
\(B=\left[7^3.\left(7-1\right)\right]^3:\left(7^3\right)^{12}\)
\(B=\left(7^3.6\right)^3:7^{36}\)
\(B=7^9.6^3:7^{36}\)
\(B=6^3:7^{27}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\frac{1-\frac{1}{\sqrt{49}}+\frac{1}{49}-\frac{1}{\left(7\sqrt{7}\right)^2}}{\frac{\sqrt{64}}{2}-\frac{4}{7}+\left(\frac{2}{7}\right)^2-\frac{4}{343}}\)
\(B=\frac{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}{4-\frac{4}{7}+\frac{4}{49}-\frac{4}{343}}\)
\(B=\frac{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}{4\left(1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}\right)}\)
\(B=\frac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=\dfrac{1-\dfrac{1}{7}+\dfrac{1}{49}-\dfrac{1}{343}}{\dfrac{8}{2}-\dfrac{4}{7}+\dfrac{4}{49}-\dfrac{4}{343}}=\dfrac{1-\dfrac{1}{7}+\dfrac{1}{49}-\dfrac{1}{343}}{4-\dfrac{4}{7}+\dfrac{4}{49}-\dfrac{4}{343}}=\dfrac{1}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
10.213
11. 2 giờ 55 phút
12. 4 ngày 21 giờ
13.
a: 6,008
b: 4500
c: 5,628
d: 4,009
14.
a,8579 cm2
b,32,04 m2
c,187200m2
d,5,017 tấn
![](https://rs.olm.vn/images/avt/0.png?1311)
14:
a: \(85.79km^2=857900000000cm^2\)
b: \(32m^24dm^2=32.04m^2\)
c: \(1872dm^2=18.72m^2\)
d: 5 tấn 17kg=5,017 tấn
13:
a: \(6dm^38cm^3=6.008dm^3\)
b: \(4.5m^3=4500dm^3\)
c: \(5628dm^3=5.628m^3\)
d: \(4m^39dm^3=4.009m^3\)
12: =108h:3+80h
=36h+80h=116h
10:
3h18p+7h21p:3
=198p:441p:3
=198p+147p=345p
73942 + 343 : 7
= 73942 + 49
= 73991