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\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
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=1358 x (15+85)+358x(590-490)
=1358x100+358x100
=100x(1358+358)
=100x1716
=171600
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85 x 72,5 + 15 x 72,5
= 72,5 x ( 85 + 15 )
= 72,5 x 100
= 72,500
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3 x 15 + 21 x 15 + 85 x 5
= 45 + 315 + 425
= 785
15 - 30 + 40
= 25
21 + 19 - 50 + 10
= 0
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=-\dfrac{1}{20}+2\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{12}\times\dfrac{3}{12}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=-\dfrac{9}{20}\)
\(3\times15+21\times15+85\times5\\ =15\times\left(3+21\right)+425\\ =15\times24+425\\ =360+425\\ =785\)
\(15-30+40\\ =\left(15+40\right)-30\\ =55-30\\ =25\)
\(21+19-50+10\\ =\left(21+19\right)-\left(50-10\right)\\ =40-40\\ =0\)
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=\dfrac{4}{20}-\dfrac{5}{20}+\dfrac{40}{20}\)
\(=\dfrac{\left(4+40\right)}{20}-\dfrac{5}{20}\)
\(=\dfrac{44}{20}-\dfrac{5}{20}\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=\dfrac{2}{20}+\dfrac{4}{20}-\dfrac{15}{20}\)
\(=\dfrac{6}{20}-\dfrac{15}{20}\)
\(=-\dfrac{9}{20}\)
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25x187+187x73+817x1+817x1
= 187x(25+73+1+1)
= 187x100
=18700
25 × 187 + 187 × 73 + 817 + 817
= 25 × 187 + 187 × 73 +187+187+1260
= 187 x ( 25+73+1+1) + 1260
= 187 x 100 + 1260
= 18700 + 1260
= 19960
chúc bn học tốt
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a) = 136 + 16 * ( 68 + 212 )
= 152 * 280
= 42560
b) = 43 * 85 - 81 + 85 * 81 - 430
= ( 85 - 85 ) + (81 - 81) * 430 + 43
= 0 + 0 * 473
= 0
nhớ k nha
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= ( 1277 + 12.74 ) x ( 85 + 25 ) - 1874 x 10
= 1289.74 x (110 - 10) - 1874
= 128974 - 1874
= 127100
1277 x 85 + 12,74 x 25 - 1874 x 10
= ( 1277 + 12,74 ) x ( 85 + 25 ) - 1874 x10
= 1289,74 x ( 110 - 10 ) -1874
=128974 - 1874
=127100Thục Hiền 2005
lon de a chac 816
= 816*15+1*15+85*816
=15+816*(15+85)
=15+816*100
=15+81600
=81615
Ủng hộ nha!