a, 49 + 28 = ? c, 17 + 36 = ?
b, 43+ 12 = ? d, 51 + 76 = ?
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a) |-15+6| = |-9| = 9
b) |-25 + (-17)| = |-42| = 42
c) | -36 + 15| = |-21| = 21
d) |-21 + 49| = | 48| = 48
e) |-21+49| = |48| = 48
g) |43 + (-28) | = | 15| = 15
h) |-23 + 33| = |10| = 10
i) |-46 + (-29) | = | -75| = 75
a) 9/22 x 33/18 =3/4
b) 12/35 : 36/25 = 5/21
c) 19/17 : 76/51 =3/4
a) \(\frac{9}{22}\times\frac{33}{18}\)
\(=\frac{9}{22}\times\frac{11}{6}\)
\(=\frac{9\times11}{22\times6}=\frac{3}{4}\)
b) \(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}\times\frac{25}{36}\)
\(=\frac{5}{21}\)
c) \(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}\times\frac{51}{76}\)
\(=\frac{3}{4}\)
\(a,\dfrac{1}{7}+\dfrac{1}{3}=\dfrac{3}{21}+\dfrac{7}{21}=\dfrac{10}{21}\\ b,\dfrac{-2}{3}+\dfrac{-5}{7}=\dfrac{-14+\left(-15\right)}{21}=\dfrac{-29}{21}\\ c,\dfrac{1}{2}-\dfrac{-1}{2}-\dfrac{1}{3}=\dfrac{3+3-2}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)
\(a.\dfrac{4}{28}+\dfrac{12}{36}=\dfrac{1}{7}+\dfrac{1}{3}=\dfrac{3}{21}+\dfrac{7}{21}=\dfrac{10}{21}\\ b.\dfrac{-12}{18}+\dfrac{-15}{21}=\dfrac{-2}{3}+\dfrac{-5}{7}=\dfrac{-14}{21}+\dfrac{-15}{21}=\dfrac{-29}{21}\\ c.\dfrac{14}{28}+\dfrac{16}{32}-\dfrac{17}{51}=\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{17}{51}=1-\dfrac{17}{51}=\dfrac{2}{3}\)
a) (-12) + 25 + 75 + 12 = (-12) + 12 + 25 + 75 = 0 +100 = 100.
b) 60 +12 + (-17) + (-43) = 60 + [(-47) + (-43)] +12.
c) (-2) + (-87) + (-18) + 87 = [(-2) + (-18)] + [(-87) + 87].
d) (-1)+(-2) + 36 + (-17) = 36+[(-1) + (-2) + (-17)].
a) 2459 - ( 400 + 459 )
= 2459 - 400 - 459
= 2000 - 400
= 1600
b) 435 x 25 +76 x 435 - 435
= 435 x 25 + 76 x 435 - 435 x 1
= 435 ( 25 + 76 - 1 )
= 435 x 100
= 43500
c) 36 x 49 + 51 x 36
= 36 ( 49 + 51 )
= 36 x 100
= 3600
a) 49+28= 76
b) 43+12=55
c) 17+36=53
d) 51+76=127
a, 49 + 28 = 77
b, 43 + 12 = 55
c, 17 + 36 = 53
d, 51 + 76 = 127