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(4 + 16 )+ (8 + 12) + 20 + 28 + 24
= 20 + 20 + 20 + 52
= 112
=9/4x2/3+16/9x4/3
=18/12+64/36
=54/36+64/36=118/36=59/18
a: \(=\dfrac{21}{11}+\dfrac{12}{11}+\left(-\dfrac{9}{19}-\dfrac{3}{19}-\dfrac{6}{19}\right)=3-\dfrac{18}{19}=\dfrac{39}{19}\)
b: \(=\dfrac{2}{3}+\dfrac{4}{3}+\dfrac{3}{4}+\dfrac{7}{4}+\dfrac{4}{5}+\dfrac{16}{5}=2+4+\dfrac{5}{2}=6+\dfrac{5}{2}=\dfrac{17}{2}\)
a) 86 - 39 - 21 = 47 - 21
= 26
b) 115 - 57 - 15 = ( 115 - 15 ) - 57
= 100 - 57
= 43
c) 4 + 8 + 12 + 16 + 20 + 24 + 28 = ( 4 + 8 + 16 + 20 + 24 + 28 ) + 12
= 100 + 12
= 112
a) 86-39-21 = 86-(39+21) = 86-60 = 26
b) 115-57-15 = 115-15-57 = 100-57 = 43
c) (4+28)+(8+24)+(12+20)+16 = 32+32+32+16 = 32 x 3 + 16 = 112
[1+3+...+13+15] x[16 x2+4x16-32x3] =[1+3+...+13+15] x 0 =0
( 1 + 3 + .... + 13 + 15 ) x ( 16 * 2 + 4 * 16 - 32 * 3 )
= ( 1+ 3 + ... + 13 + 15) x ( 16 * 2 + 4 * 16 - 16 * 2 * 3)
= ( 1 + 3 + ...+ 13 + 15) x { [ 16 * ( 2 + 4 - 2 * 3 ) ] }
= ( 1 + 3 + ... + 13 + 15 ) x 16 * 0
= ( 1 + 3 + .... +13 +15 ) x 0
=0
1/2+1/4+1/8+1/16+1/32+1/64
=(1/2+1/4+1/8)+(1/16+1/32+1/64)
=(4/8+2/8+1/8)+(4/64+2/64+1/64)
=7/8+7/64
=56/64+7/64
=63/64
B = \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\)
2 x B = 1 + \(\dfrac{1}{2}\)+ \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\)+ \(\dfrac{1}{32}\)
2 x B - B = 1 - \(\dfrac{1}{64}\)
B = \(\dfrac{63}{64}\)
32 - 16 + 28 - 24
= ( 32 + 28 ) - ( 16 + 24 )
= 60 - 40
= 20
32-16+28-24
=(32+28)-(16+24)
=60-40
=20
chúc các bn cuối tuần vui vẻ !