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a, \(3^6:3^3+2^3.2^2\\ =3^3+2^5=27+32=59\)
b, \(\left(39.42-37.42\right):42\\ =42.\left(39-37\right):42\\ =39-37=2\)
a, 36 : 32 + 23 . 22 = 34 + 25 = 81 + 32 = 113
b, ( 39.42 - 37.42 ) : 42
= 42. ( 39 - 37 ) : 42
= 42 . 2 : 42
= 84 : 42
= 2
a)
204 - 84:12 = 204 - 7 = 197
b)
15.23 + 4.32 - 5.7 = 15.8 + 4.9 – 5.7 = 120 + 36 - 35 = 121
c) Áp dụng:
am . an = am+n
am : an = am-n
56:53 + 23.22 = 53 + 25 = 125 + 32 = 157
d)
164.53 + 47.164 = 164(53 + 47) = 164.100 = 16400
a) 204 - 84 : 12
= 204 - 7 = 197
b) 15.23 + 4.32 - 5.7
= 15.8 + 4.9 - 35
= 120 + 36 - 35
= 156 - 35
= 121
c) 56 : 53 + 23.22
= 56 - 3 + 23 + 2
= 53 + 25
= 125 + 32
= 157
d) 164.53 + 47.164
= 164.( 53 + 47 )
= 164.100
= 16400
a)\(\frac{2}{3}+\frac{3}{4}+\frac{5}{6}\)
\(=\frac{8+9+10}{12}\)
\(=\frac{27}{12}=\frac{9}{4}\)
b)\(\frac{15}{8}-\frac{7}{12}+\frac{5}{6}\)
\(=\frac{45-14+20}{24}\)
\(=\frac{51}{24}=\frac{17}{8}\)
2)
a)\(\frac{2}{5}+\frac{7}{13}+\frac{3}{5}+\frac{1}{7}\)
\(=\frac{2}{5}+\frac{3}{5}+\frac{7}{13}+\frac{1}{7}\)
\(=1+\frac{7}{13}+\frac{1}{7}\)
\(=\frac{20}{13}+\frac{1}{7}\)
\(=\frac{153}{91}\)
Tí tớ trả lời tiếp
a, 6/7+5/9+8/7-2/9=(6/7+8/7)+(5/9-2/9)=14/7+3/9=2+1/3=7/3
b, 5+7/3=22/3
= -4/3 - 17/6 . 6/11 + 3 : 1/20
= - 4/3 - 17/11 + 60
= 1885/33
\(N=-2\frac{2}{3}-0,2+1,75-\frac{5}{6}+0,7\)
\(N=\frac{-8}{3}-\frac{1}{5}+\frac{7}{4}-\frac{5}{6}+\frac{7}{10}\)
\(N=\frac{-160}{60}-\frac{12}{60}+\frac{105}{60}-\frac{50}{60}+\frac{42}{60}\)
\(N=\frac{\left[\left(-160\right)-12+105-50=42\right]}{60}\)
\(N=\frac{-75}{60}=\frac{-5}{4}\)
\(\Rightarrow N=\frac{-5}{4}\)
= -8/3 - 1/5 + 7/4 - 5/6 + 7/10 =
= -43/15 + 11/12 + 7/10 =
= -39/20 + 7/10 =
= -5/4
tk cho mình nhé bạn
a) 80 - (4.52 - 3.23)
= 80 - 100 + 24
= 4
b) 23.75 + 25.23 + 180
= 25.(23.3 + 23) + 180
= 25.23.4 + 180
= 100.23 + 180
= 2300 + 180
= 2480
c) 2448 : [119 - (23 - 6)]
= 2448 : (119 - 17)
= 2448 : 102
= 24
a,80 - (100-24)
= 80-76
= 4
b,1725+575+180
=2300+180
=2480
c,2448 : [119-17]
=2448 : 102
= 24
mik mong bn sẽ làm đúng
\(\frac{14.2^5+3.2^6}{2^6}=\frac{2^5\left(14+3.2\right)}{2^6}=\frac{14+6}{2}=\frac{20}{2}=10\)
2 mũ 5 nhân ( 14 + 6 ) trên 2 mũ 6
= 20/2
= 10