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a/ 25 x 69 x 4
= (25 x 4) x 69
= 100 x 69
= 6900
b/ 38 x 85 + 38 x 15
= 38 x (85 + 15)
= 38 x 100
= 3800
a/ 25 x 69 x 4
= (25 x 4) x 69
= 100 x 69
= 6900
b/ 38 x 85 + 38 x 15
= 38 x (85 + 15)
= 38 x 100
= 3800
a, 2x9x5x7x4x25
=(2x5)x(4x25)x(9x7)
=10x100x63
=63x1000
=63000
b, 6x14x5x25x3x4
=6x2x7x5x3x(4x25)
=(6x7x3)x(2x5)x100
=122x10x100
=122x1000
=122000
a) \(2\times9\times5\times7\times4\times25\)
\(=\left(2\times5\right)\times\left(4\times25\right)\times\left(9\times7\right)\)
\(=10\times100\times63=63000\)
b) \(6\times14\times5\times25\times3\times4\)
\(=\left(6\times3\right)\times\left(14\times5\right)\times\left(25\times4\right)\)
\(=18\times70\times100=126000\)
a) 20 × 190 × 50 = (20 × 50) × 190 = 1000 × 190
= 190000
b) (900 × 28) ÷ 9 = (900 ÷ 9) × 28 = 100 × 28 = 2800
a) 3478 + 899 + 522 = (3478 + 522) + 899
= 4000 + 899
= 4899
b) 7955 + 685 + 1045 = (7955 + 1045 ) + 685
= 9000 + 685
= 9685
a. 5816 + 2009 + 3184 = ( 5816 + 3184) +2009 = 9000 + 2009= 11009
b. 2750 + 3128 + 1272 = 2750 + ( 3128 + 1272)= 2750 + 4400= 7150
a) 6257 + 989 + 743
= 6257 +743 + 989
= 7000 + 989 = 7989
b) 5798 + 322 + 4678
= 5798 + 5000 = 10798
Hướng dẫn giải:
a. 88 + 75 + 12 = (88 + 12) + 75 = 100 + 75 = 175
b. 146 + 55 + 54 = (146 + 54) + 55 = 200 + 55 = 255.
A = \(\dfrac{48\times48-48\times47-48}{235\times137-37\times235}\)
A = \(\dfrac{48\times48-48\times47-48\times1}{235\times137-37\times235}\)
A = \(\dfrac{48\times\left(48-47-1\right)}{235\times137-37\times235}\)
A = \(\dfrac{48\times0}{235\times137-37\times235}\)
A = 0
a: \(\dfrac{2}{9}-\dfrac{1}{5}+\dfrac{7}{9}-\dfrac{4}{5}\)
\(=\left(\dfrac{2}{9}+\dfrac{7}{9}\right)+\left(-\dfrac{1}{5}-\dfrac{4}{5}\right)\)
\(=\dfrac{9}{9}+\dfrac{-5}{5}=1-1=0\)
b: \(\dfrac{1}{12}+\dfrac{3}{16}+\dfrac{5}{16}+\dfrac{5}{12}\)
\(=\left(\dfrac{1}{12}+\dfrac{5}{12}\right)+\left(\dfrac{3}{16}+\dfrac{5}{16}\right)\)
\(=\dfrac{6}{12}+\dfrac{8}{16}=\dfrac{1}{2}+\dfrac{1}{2}=1\)