10+90=
56+4=
65+25=
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1. \(\left(27-514\right)-\left(486-78\right)\)
\(=\left(-487\right)-408\)
\(=-895\)
2. \(\left(65-100\right)-\left(25-100\right)\)
\(=\left(-35\right)-\left(-75\right)\)
\(=40\)
3. \(\left(567-67\right)-\left(56+4+33\right)\)
\(=500-93\)
\(=407\)
\(Cau1\left(27-514\right)-\left(486-78\right)\)
\(=\left(-487\right)-408\)
\(=-895\)
\(Cau2:\left(65-100\right)-\left(25-100\right)\)
\(=-35-\left(-75\right)\)
\(=40\)
\(Cau3:\left(567-67\right)-\left(56+4+33\right)\)
\(=500-\left(60+33\right)\)
\(=500-93\)
\(=407\)
a) 31 . 65 + 31 . 35 - 500
=31(65+35)-500
=31..100-500
=3100-500
=2600
253 - (-76 + 253) + 99 =175
68 - (199 + 68) - (-150) = -49
211 - (107 + 211) - 23 = -130
-(-345 + 56 - 267) + (453 - 124 - 843) =42
-25 - (34 - 256 + 67) - (-2) + (-10 - 65) =57.
a) 10; 13; 18; 26; 36; 52...
c) 0; 1; 4; 9; 16; 25...
m) 1; 4; 9; 16; 25; 36; 49; 64...
p) 1; 3; 9; 27; 81; 243...
25 + 65 – 30 = 90 – 30 = 60.
90 – 40 – 26 = 50 – 26 = 24.
a)
\(\dfrac{1}{2}=0,5;\dfrac{3}{4}=0,75;\dfrac{7}{5}=1,4;\dfrac{9}{8}=1,125;\dfrac{26}{25}=1,04;\dfrac{120}{125}=0,96\)
b)
\(\dfrac{15}{25}=0,6;\dfrac{75}{25}=3;\dfrac{90}{300}=0,3;\dfrac{27}{36}=0,75;\dfrac{51}{85}=0,6\)
a,1/2=5/10;3/4=75/100;7/5=140/100;26/25=108/100;120/125=960/1000
b,15/25=60/100;75/25=300/100;90/300=3/10;27/36=3/4=75/100;
51/85=3/5=60/100;39/65=3/5=60/100
10+90=100
56+4=60
65+25=90
10+90=100
56+4=60
65+25=90
k mk nha mk k rồi