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a, 35.(34+86) + 65.(75+45)
=35.120 + 65.120
=120.(35+65)
=120. 100
=12000
a) 35 * 34 + 35 * 86 + 65 * 75 + 65 * 45
= 35 x ( 34 + 86 ) x 65 x ( 75 + 45 )
= 35 x 120 x 65 x 120
= 120 x ( 35 + 65 )
= 120 x 100
= 12000
35 x 34 + 35 x 86 + 65 x 75 + 65 x 45
= 1190 + 35 x 86 + 65 x 75 + 65 x 45
= 1190 + 3010 + 65 x 75 + 65 x 45
= 1190 + 3010 + 4875 + 65 x 45
= 1190 + 3010 + 4875 + 2925
= 12000
a) 35 x 34 + 35 x 86 + 65 x 75 + 65 x 45
= 35 x ( 34 + 86 ) + 65 x ( 75 + 45 )
= 35 x 120 + 65 x 120
= 120 x ( 35 + 65 )
= 120 x 100
= 12 000
a, 39 . 8 + 60 . 2 + 21 . 8
= 39 . 8 + 15 . 4 . 2 + 21 . 8
= 39 . 8 + 15 . 8 + 21 . 8
= 8 . ( 39 + 15 + 21 )
= 8 . 75
= 600
b, 12 . 53 + 53 . 172 - 53 . 84
= 53 . ( 12 + 172 - 84 )
= 53 . 100
= 5300
c, 35 . 34 + 35 . 86 + 65 . 75 + 65. 67 + 65.45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 67 + 45 )
= 35 . 120 + 65 . 187
= 4200 + 12155
= 16355
d, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100
= 11000
a, 39 . 8 + 60 . 2 + 21 . 8
= 39 . 8 + 15 . 4 . 2 + 21 . 8
= 39 . 8 + 15 . 8 + 21 . 8
= 8 . ( 39 + 15 + 21 )
= 8 . 75
= 600
b, 12 . 53 + 53 . 172 - 53 . 84
= 53 . ( 12 + 172 - 84 )
= 53 . 100
= 5300
c, 35 . 34 + 35 . 86 + 65 . 75 + 65. 67 + 65.45
= 35 . ( 34 + 86 ) + 65 . ( 75 + 67 + 45 )
= 35 . 120 + 65 . 187
= 4200 + 12155
= 16355
d, 36 . 28 + 36 . 82 + 64 . 69 + 64 . 41
= 36 . ( 28 + 82 ) + 64 . ( 69 + 41 )
= 36 . 110 + 64 . 110
= 110 . ( 36 + 64 )
= 110 . 100
= 11000
35 * 34 + 35 * 34 + 65 * 75 + 65 * 45
= 34* ( 35+35) + 65* ( 75 + 45)
= 34 * 70 + 65* 120
= 2380 + 7800
= 10180
\(=35.\left(34+34\right)+65.\left(75+45\right)\)
\(=35.68+65.120=2380+7800=10180\)
a. 35.34 + 35.86 + 65.75 + 65.45
= 35.(34 + 86) + 65.(75 + 45)
= 35.120 + 65.120
= 120.(35 + 65)
= 120.100
= 12000
b. 21.72 - 11.72 + 90.72 + 49.1258.16
= 21.72 - 11.72 + 90.72 + 72.1258.16
= 72.(21 - 11 + 90 + 1258.16)
= 72.20228
= ... (Không tính nhanh được :3).
a. 35.34 + 35.86 + 65.75 + 65.45
= 35.(34 + 86) + 65.(75 + 45)
= 35.120 + 65.120
= 120.(35 + 65)
= 120.100
= 12000
b. 21.72 - 11.72 + 90.72 + 49.1258.16
= 21.72 - 11.72 + 90.72 + 72.1258.16
= 72.(21 - 11 + 90 + 1258.16)
= 72.20228
= ... (Không tính nhanh được :3).
c) 135135.137 - 135.137137 = 135.1001.137 - 135.137.1001 = 0
=> (1 + 3 + ... + 2015).(135135.137 - 135.137137) = (1 + 3 + ... + 2015). 0 = 0
d) 35.34 + 35.86 + 65.75 +65.45
= (35.34 + 35.86) + (65.75 + 65.45)
= 35.(34 + 86) + 65.(75 +45)
= 35. 120 + 65. 120
= (35 + 65).120
= 100.120 = 12000
e) 3.25.8 + 4.37.6 + 2.38.12
= 3.25.4.2 + 2.2.37.6 + 2.38.6.2
= 3.(25.4).2 + 2.2.6.(37 + 38)
= 3.100.2 + 4.6.75
= 600 + 6.(4.75)
= 600 + 6.300
= 600 + 1800
=2400
35*(34+86)+65*(75+45)
= 35*120+65*120
= 120*(35+65)
= 120*100
= 12000
\(35\cdot34+35\cdot86+65\cdot75+65\cdot45\)
\(=35\left(34+86\right)+65\left(75+45\right)\)
\(=35\cdot120+65\cdot120\)
\(=120\left(35+65\right)\)
\(=120\cdot100\)
\(=12000\)
35.34+35.86+65.75+65.45=1190+3010+4875+2925
=4200+7800
=12000