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29-(10+29)=x-(27-9)
20-10-9=x-27+9
10-9=x-36
1=x-36
x-36=1
x=1+36
x=37
Ta có:\(\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)=\(\frac{5.2^{30}.3^{18}-2^2.3^{20}.2^{27}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)=\(\frac{5.2^{30}.3^{18}-2^2.3^{20}.2^{27}}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}\)
=\(\frac{2^{29}.3^{18}.(5.2-9)}{2^{28}.3^{18}.(5.3-7.2)}\)=\(\frac{2^{29}.3^{18}.1}{2^{28}.3^{18}.1}\)=\(\frac{2}{1}\)= 2
bai 1
cach 1 9(9-3-5)=9.1=9
cach 2 81-27-45=9
bai 2
cách 1 551-337-551+247=-90
c 2 29.6-19.16=-90
a) cách 1 :
\(81-9\times\left(3+5\right)\)
\(=81-9\times8\)
\(=81-72\)
\(=9\)
cách 2 :
b) \(81-9\times\left(3+5\right)\)
\(=81-\left(9\times3+9\times5\right)\)
\(=81-\left(27+45\right)\)
\(=81-72\)
\(=9\)
\(\text{(-27).18+77.(-27)+(-27).5}\)
\(=\left(-27\right).\left(18+22+5\right)\)
\(=\left(-27\right).45\)
\(=-1215\)
\(\left(-2\right)^3+\left(29-37\right)-\left(-10\right)\)
\(=\left(-8\right)+\left(-8\right)+10\)
\(=-16+10\)
\(=-6\)
a, -(-29 – 7) + (-44 + 19)
\(=36-25\)
\(=11\)
b, (34 – 54 – 9) – 45 – (-3)
\(=-29-45+3\)
\(=-71\)
c, -(-27 – 77 – 2) + 78
\(=106+78\)
\(=184\)
d, 25 + (-81 – 6 – 20)
\(=25-107\)
\(=-82\)
chúc bạn học tốt
71-3x(29-2xy)=20
3x(29-2xy)=71-20
3x(29-2xy)=51
29-2x=51:3
29-2x=17
2x=29-17
2x=12
x=12:2
Vay x=6
29 - (10 + 29) = x - (27 - 9)
29 - 39 = x - (27 - 9)
-10 = x - (27 - 9)
-10 = x - 18
⇔ x - 18 = -10
x = (-10) +18
x = 8
Vậy x = 8
29 - (10 + 29) = x - (27 - 9)
29 - 39 = x - 18
-10 = x - 18
⇔ x - 18 = -10
x = (-10) + 18
x = 8