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a: \(=36:4+2\cdot25=9+50=59\)
b: \(=79\left(82+18\right)=79\cdot100=7900\)
c: \(=49-9-\left(4^2+2^2\right)\)
\(=40-16-4=40-20=20\)
d: \(=16+\left[400:\left(200-42-138\right)\right]\)
\(=16+400:20=16+20=36\)
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
B1:
\(\frac{42}{46}+\frac{250}{186}+\frac{-2121}{2323}+\frac{-125125}{143143}\)
=\(\frac{21}{23}+\frac{125}{143}+\frac{-21}{23}+\frac{-125}{143}\)
=\(\left(\frac{21}{23}+\frac{-21}{23}\right)+\left(\frac{125}{143}+\frac{-125}{143}\right)\)
=0+0=0
làm một câu thôi nha :33
Chúc bạn học tôt!
a) 2x - 138 = 32 . 23
2x - 138 = 72
2x = 72 + 138
2x = 210
x = 105
b) 6x - 39 = 588 : 28
6x - 39 = 21
6x = 21 + 39
6x = 60
x = 60 : 6 = 10
c)42 . x + 37 . 42 = 39 . 42
42 . (x + 37) = 1638
x + 37 = 1638 : 42
x + 37 = 39
x = 39 - 37
x = 2
a) A = 53 - 6 . 52 + 6 . 5 - 5
= 5 ( 52 - 6 . 5 + 6 - 1 )
= 5 ( 25 - 30 + 6 - 1 )
= 5 . 0
= 0
b) Câu b theo mình đề thế này nhé bạn
\(B=\frac{-3}{20}+\frac{-3}{30}+\frac{-3}{42}+\frac{-3}{56}+\frac{-3}{72}+\frac{-3}{90}\)
\(B=-3\left(\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}\right)\)
\(B=-3\left(\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)
\(B=-3\left(\frac{5-4}{4.5}+\frac{6-5}{5.6}+\frac{7-6}{6.7}+\frac{8-7}{7.8}+\frac{9-8}{8.9}+\frac{10-9}{9.10}\right)\)
\(B=-3\left(\frac{5}{4.5}-\frac{4}{4.5}+\frac{6}{5.6}-\frac{5}{5.6}+\frac{7}{6.7}-\frac{6}{6.7}+\frac{8}{7.8}-\frac{7}{7.8}+\frac{9}{8.9}-\frac{8}{8.9}+\frac{10}{9.10}-\frac{9}{9.10}\right)\)
\(B=-3\left(\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)
\(B=-3\left(\frac{1}{4}-\frac{1}{10}\right)\)
\(B=-3\left(\frac{5}{20}-\frac{2}{20}\right)\)
\(B=-3.\frac{3}{20}\)
\(B=\frac{-9}{20}\)
a, 20 - [ 30- ( 5-1)22]
= 20 - (30 - 42)
= 20 - (30 - 16)
= 20 - 14
= 6
b, ( 39 . 42 - 37 . 42 ) : 42
= 42.(39 - 37) : 42
= 39 - 37
= 2
d, 333 : 322 + 233 . 22
= 3 + 25
= 3 + 32
= 35
(39 . 42 - 37 . 42) : 42
= 42 . (39 - 37)
= 42 . 2
= 84
= 84 : 42
= 2