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a) 15 x 1358 + 590 x 358 + 85 x 1358 - 490 x 358
=15 x 1358 + 85 x 1358 + 590 x 358 - 490 x 358
=1358x(15+85)+358x(590-490)
=1358x100+358x100
=135800+35800
=171600
b) 9,3 x 45 + 9,3 x 5,7 - 18,6
=9,3x(45+5,7)-18,6
=9,3x50,7-18,6
=471,51-18,6
=452,91
\(A=2,53\times17+17,67\times15+2,53\times83+17,67\times85\)
\(A=2,53\times17+2,53\times83+17,67\times15+17,67\times85\)
\(A=2,53\times\left(17+83\right)+17,67\times\left(15+85\right)\)
\(A=2,53\times100+17,67\times100\)
\(A=253+1767\)
\(A=2020\)
= 816*15+1*15+85*816
=15+816*(15+85)
=15+816*100
=15+81600
=81615
Ủng hộ nha!
3 x 15 + 21 x 15 + 85 x 5
= 45 + 315 + 425
= 785
15 - 30 + 40
= 25
21 + 19 - 50 + 10
= 0
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=-\dfrac{1}{20}+2\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{12}\times\dfrac{3}{12}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=-\dfrac{9}{20}\)
\(3\times15+21\times15+85\times5\\ =15\times\left(3+21\right)+425\\ =15\times24+425\\ =360+425\\ =785\)
\(15-30+40\\ =\left(15+40\right)-30\\ =55-30\\ =25\)
\(21+19-50+10\\ =\left(21+19\right)-\left(50-10\right)\\ =40-40\\ =0\)
\(\dfrac{1}{5}-\dfrac{1}{4}+2\)
\(=\dfrac{4}{20}-\dfrac{5}{20}+\dfrac{40}{20}\)
\(=\dfrac{\left(4+40\right)}{20}-\dfrac{5}{20}\)
\(=\dfrac{44}{20}-\dfrac{5}{20}\)
\(=\dfrac{39}{20}\)
\(\left(\dfrac{1}{4}+\dfrac{1}{6}\right)\times\left(\dfrac{1}{2}-\dfrac{1}{4}\right)\)
\(=\dfrac{5}{12}\times\dfrac{1}{4}\)
\(=\dfrac{5}{48}\)
\(\dfrac{1}{10}+\dfrac{1}{5}-\dfrac{3}{4}\)
\(=\dfrac{2}{20}+\dfrac{4}{20}-\dfrac{15}{20}\)
\(=\dfrac{6}{20}-\dfrac{15}{20}\)
\(=-\dfrac{9}{20}\)
( 1245 + 1358 + 985749 + 98879097 + 987654321 ) : 2019 = 1087521752 : 2019 = 538643 . 7603 ( có dư )
=1358 x (15+85)+358x(590-490)
=1358x100+358x100
=100x(1358+358)
=100x1716
=171600
= 1358 x ( 15 + 85) + 358 x ( 590 - 490)
= 1358 x 100 + 358 x 100
= 100 x ( 1358 + 358 )
= 100 x 1716 = 171600