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làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
791:789+5.52-124
=791:789+5.25-124
=791-89+125-124
=72+125-124
=49+125-124
=174-124
=50
4.15+28:7-620:618
=60+4-620-18
=64-62
=64-36
=28
(32+23):7
=(9+8):7
=17:7
=17/7
1125:1123-35:(110+23)-60
=1125:1123-35:(1+8)-60
=1125:1123-35:9-60
=1125:1123-35:33-60
=1125-23-35-3-60
=112-32-60
=121-9-60
=112-60
=52
\(52-4.\left(5.5^x+7\right)=4\)
\(\Rightarrow4.\left(5.5^x+7\right)=48\)
\(\Rightarrow5.5^x+7=12\)
\(\Rightarrow5.5^x=5\)
\(\Rightarrow5^x=1\)
\(\Rightarrow x=0\)
\(3^{x+3}-2.3^x=5^2.81\)
\(\Rightarrow3^x.27-2.3^x=2025\)
\(\Rightarrow3^x.\left(27-2\right)=2025\)
\(\Rightarrow3^x.25=2025\)
\(\Rightarrow3^x=81\)
\(\Rightarrow3^x=3^4\)
\(\Rightarrow x=4\)
a: \(=\dfrac{-3}{5}\cdot\dfrac{5}{7}+\dfrac{-3}{5}\cdot\dfrac{3}{7}+\dfrac{-3}{5}\cdot\dfrac{6}{7}\)
\(=\dfrac{-3}{5}\left(\dfrac{5}{7}+\dfrac{3}{7}+\dfrac{6}{7}\right)=\dfrac{-3}{5}\cdot2=-\dfrac{6}{5}\)
b: \(=\dfrac{3}{13}\cdot\dfrac{6}{11}+\dfrac{3}{13}\cdot\dfrac{5}{11}-\dfrac{2}{13}=\dfrac{3}{13}-\dfrac{2}{13}=\dfrac{1}{13}\)
c: =>1/2x+1+3/8=7/16
=>1/2x=-15/16
=>x=-15/8
d: =>5/2x-1/3=1/6*(-9)/2=-9/12=-3/4
=>5/2x=-3/4+1/3=-9/12+4/12=-5/12
=>x=-1/6
Thế này mới đúng
\(\left(7x-11\right)^3=2^5.5^26+200\)
= \(\left(7x-11\right)^3=1000\)
= \(\left(7x-11\right)^3=10^3\)
= \(\left(7x-11\right)=10\)
= \(7x=10+11\)
= \(7x=21\)
=> \(x=21:7\)
=> x = 3
Bạn thử vào x chắc chắn đúng 99,9%
= \(\left(7.x-11\right)^3=1000\)
= \(\left(7.x\right)^3=1000+11=1011\)
= \(\left(7.x\right)^3=1011\)
= \(1011:7=\frac{1011}{7}\)
= \(x^3=\frac{1011}{7}=1,433790434\)
Câu 1 :
a, 8.( -5 ).( -4 ).2
= [ 8.2 ].[( -5 ).(-4 ]
= 16.20
= 320
b, \(1\frac{3}{7}+\frac{-1}{3}+2\frac{4}{7}\)
\(=\frac{10}{7}+\frac{-1}{3}+\frac{18}{7}\)
\(=\frac{11}{3}\)
c, \(\frac{8}{5}.\frac{2}{3}+\frac{-5.5}{3.5}\)
\(=\frac{8}{3}+\frac{-5}{3}\)
\(=\frac{3}{3}=1\)
d, \(\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{16}.4\)
\(=\frac{55}{56}-\frac{3}{4}\)
\(=\frac{13}{56}\)
Câu 2 :
a, 2x + 10 = 16
2x = 16 + 10
2x = 26
x = 26 : 2
x = 13
b, \(x-\frac{1}{3}=\frac{5}{4}\)
\(x=\frac{5}{4}+\frac{1}{3}\)
\(x=\frac{19}{12}\)
c, \(2x+3\frac{1}{3}=7\frac{1}{3}\)
\(2x+\frac{10}{3}=\frac{22}{3}\)
\(2x=\frac{22}{3}-\frac{10}{3}\)
\(2x=4\)
\(x=4:2\)
\(x=2\)
d, \(\left(\frac{2}{11}+\frac{1}{3}\right)x=\left(\frac{1}{7}-\frac{1}{8}\right).56\)
\(\frac{17}{33}x=1\)
\(x=1-\frac{17}{33}\)
\(x=\frac{16}{33}\)
\(-35\cdot\frac{2}{7}+\frac{-3}{-5}\cdot\frac{5}{7}+2\frac{3}{5}\)
\(=-\frac{10}{7}+\frac{-3}{-5}\cdot\frac{5}{7}+2\frac{3}{5}\)
\(=-\frac{10}{7}+\frac{3}{5}\cdot\frac{5}{7}+\frac{13}{5}\)
\(=-\frac{10}{7}+\frac{3}{7}+\frac{13}{5}\)
\(=-1+\frac{13}{5}=\frac{8}{5}\)
-4\11.2\5+6\11.-3\10