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a) (100 + 67) x 67 + (200 - 33) x 33
= 167 x 67 + 167 x 33
= 167 x (67 + 33)
= 167 x 100
= 16700
b) 45,651 x 73 + 45,651 x 20 + 45,651 x 7
= 45,651 x (73 + 20 + 7)
= 45,651 x 100
= 4565,1
c) 14,2 x 30 + 14,2 x 57 + 14,2 x 13
= 14,2 x (30 + 57 + 13)
= 14,2 x 100
= 1420
a) (100 + 67) × 67 + (200 - 33) × 33
= 167 × 67 + 167 × 33
= 167 × 100
= 16700
b) 45,651 × 73 + 45,651 × 20 + 45,651 × 7
= 45,651 × (73 + 20 + 7)
= 45,651 × 100
= 4565,1
c) 14,2 × 30 + 14,2 × 57 + 14,2 × 13
= 14,2 × (30 + 57 + 13)
= 14,2 × 100
= 1420
a) \(\left(100+67\right).67+\left(200-33\right).33\)
\(=167.67+167.33\)
\(=167.\left(67+33\right)\)
\(=167.100\)
\(=16700\)
b) \(45,651.73+45,651.20+45,651.7\)
\(=45,651.\left(73+20+7\right)\)
\(=45,651.100\)
\(=4565,1\)
c) \(14,2.30+14,2.57+14,2.13\)
\(=14,2.\left(30+57+13\right)\)
\(=14,2.100\)
\(=1420\)
_Chúc bạn học tốt_
a, 45,651 x ( 73 + 20 + 7 )
= 45,651 x 100
= 4565,1
b, 35 . 11 . 0,1 + 0,25 . 100 . 0
= 35 . 1,1 + 0
= 38,5
45,651 x 73 + 45,651 x 20 + 45,651
= 45,651 x ( 73 + 20 + 1 )
= 45,651 x 94
= 4291,194
\(\dfrac{45.21.25}{7.15.36}=\dfrac{3.3.3.5.7.5.5}{7.5.3.3.2.3.2}=\dfrac{25}{4}\)
45\7 x 21\15 x 25/36
=45x21x25/7x15x36
=15x3x7x3x25/7x15x3x12
=3x25/12
=75/12
=25/4
\(\left(x+\dfrac{1}{3}\right)\times\dfrac{9}{14}\times\dfrac{7}{3}-\dfrac{1}{3}=1:\dfrac{9}{5}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}-\dfrac{1}{3}=\dfrac{5}{9}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{5}{9}+\dfrac{1}{3}\\ \Rightarrow\left(x+\dfrac{1}{3}\right)\times\dfrac{3}{2}=\dfrac{8}{9}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{8}{9}:\dfrac{3}{2}\\ \Rightarrow x+\dfrac{1}{3}=\dfrac{16}{27}\\ \Rightarrow x=\dfrac{16}{27}-\dfrac{1}{3}\\ \Rightarrow x=\dfrac{7}{27}\)
