Tính nhanh : 34+85+66+115+155
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34.66 - 34.4 - 66.34 - 66.4
= ( 34.66 - 66.34) - ( 34.4 +66.4)
= 0 - 4.(34+66)
= -4.100
= -400
\(34.\left(66-4\right)-66.\left(34+4\right)\\ =34.66-34.4-66.34-66.4\\ =\left(34-34-4\right).66-34.4\\ =-4.66-34.4\\ =4.\left(-66\right)-34.4\\ =4.\left(-66-34\right)\\ =4.\left(-100\right)\\=-400\\ -264.\left(-400\right).264.40\\ =264.400.264.40\\ =264.4.100.264.4.10\\ =264.4.264.4.\left(100.10\right)\\ =\left(264.4\right)^2.1000\\ =1115136.1000=1115136000\)
34 x (52 - 85) - 52 x (85 + 34)
= 34 x 52 - 34 . 85 - 52 x 85 - 52 x 34
= (34 x 52 - 52 x 34) - (34 + 52) x 85
= 86 x 85
= 7310
34 x (52 - 85) - 52 x (85 + 34)
= 34 x 52 - 34 x 85 - ( 52 x 85 + 52 x 34)
= 34 x 52 - 34 x 85 - 52 x 85 - 52 x 34
= (34 x 54 - 52 x 34) + (34 - 52) x 85
= 0 + (-18) x 85
= -1530
\(34.\left(66-5\right)\)\(-66.\left(34+5\right)\)
\(=34.66-34.5\)\(-66.34-66.5\)
\(=-34.5-66.5\)
\(=5.\left(-34-66\right)\)
\(=5.\left(-100\right)\)
\(=-500\)
k mk nhe
\(41\times36+59\times90+41\times84+59\times30=41\times\left(36+84\right)+59\times\left(90+30\right)=41\times120+59\times120=120\times\left(41+59\right)=120\times100=12000\)
\(4\times51\times7+2\times86\times7+12\times2\times7=4\times7\times\left(51+43+6\right)=28\times100=2800\)
\(87+35+13=100+35=135\)
\(62+34+66=62+100=162\)
\(212+109+188=400+109=509\)
\(305+195+110=500+110=610\)
\(15+46+85+54=100+100=200\)
\(277+144+86+123=400+230=630\)
A = 1 3 − 3 4 − − 3 5 + 1 72 − 2 9 − 1 36 + 1 15 = 1 3 − 3 4 + 3 5 + 1 72 − 2 29 − 1 36 + 1 15 = 1 3 + 3 5 + 1 15 − 3 4 − 2 9 − 1 36 + 1 72 = 5 15 + 9 15 + 1 15 − 27 36 − 8 36 − 1 36 + 1 72 = 3 − 1 + 1 72 = 2 + 1 72 = 2 1 72
Tính bằng cách thuận tiện nhất:
\dfrac{1}{4}+\dfrac{2}{5}+\dfrac{3}{4}+\dfrac{3}{5}41+52+43+53
34 + 85 + 66 + 115 + 155
= (34 + 66) + (85 + 115) + 155
= 100 + 200 + 155
= 455
34+85+66+115+155
=(66+34)+(85+115)+155
= 100 + 200 +155
= 300 + 155
= 455