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a) 48.19 + 48.115 + 134.52
= 48.(19+115)+134.52
= 48.134+134.52
= 134.(48+52)
= 134.100
= 13400
$b.27.121+87.27+73.3= 27.(121+87)+73.34b) 27.121 + 87.27 + 73.34
= 27.(121+87)+73.34
= 27.208 + 73.34
= 5616 + 2482
= 8098
Bạn ơi, câu 1 phải là 48 . 19 + 48. 115 + 134.52 chứ bạn, sao lại là 48 . 19 + 48 . 115 . 134. 52 thế thì sao tính nhanh được . Đây nhé :
a) 48 . 9 + 48 . 115 + 134 . 52
= 48 . ( 19 + 115 ) . 134 . 52
= 48 . 134 + 134 . 52
= 134 . ( 48 + 52 )
= 134 . 100
= 13400
b) 27 . 121 - 87 . 27 + 73 .34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= 34 . ( 73 + 27 )
= 34 . 100
= 3400
Tick cho mình nhé, Thanks bạn nhìu !!!!!!
35 . 23 .+ 35 . 41 + 64 . 65 =35(23+41)+64.65=35.64+64.65=64(35+65)=64.100=6400
29 . 87 - 29 . 23 + 64 . 71 =29(87-23)+64.71=29.64+64.71=64(29+71)=29.100=2900
27 . 121 - 87 . 27 + 73 . 34 =27(121-87)+73.34=27.34+73.34=34(27+73)=34.100=3400
35 . 23 + 35 . 41 + 64 . 65 29 . 87 - 29 . 23 + 64 . 71
= 35 . ( 23 + 41 ) + 64 . 65 = 29 . ( 87 - 23 ) + 64 . 71
= 35 . 64 + 64 . 65 = 29 . 64 + 64 . 71
= 64 . ( 35 + 65 ) = 64 . ( 29 + 71 )
= 64 . 100 = 64 . 100
= 6400 = 6400
27 . 121 - 87 . 27 + 73 . 34
= 27 . ( 121 - 87 ) + 73 . 34
= 27 . 34 + 73 . 34
= 34 . ( 27 + 73 )
= 34 . 100
= 3400
Đó chính là câu trả lời bạn nhớ tích cho mình nhé
125.98-125.46-52.25
=25.5.98-25.5.46-52.25
=25.490-25.230-52.25
=25.(490-230-52)
=25.208
=5200
Tick mình nha bạn
125 . 98 - 125 . 46 - 52 . 25
= 125 . 98 - 125 . 46 - 10,4 . 125
= 125. ( 98 - 46 - 10,4 )
= 125 . 41,6
= 5200
a) 35.23+35.41+64.65
= 35.(23+41)+64.65
=35.64+64.65
=64.(35+65)
=64.100
=6400
b) 29.87-29.23+64.71
=29.(87-23)+64.71
=29.64+64.71
=64.(29+71)
=64.100
=6400
c) 27.121-87.27+73.34
=27.(121-87)+73.34
=27.34+73.34
=34.(27+73)
=34.100
=3400
a) \(48.19+48.15+134.52\)
\(=48\left(19+15\right)+6968\)
\(=48.34+6968\)
\(=1632+6968\)
\(=8600.\)
b) \(27.121-87.27+73.34\)
\(=27\left(121-87\right)+73.34\)
\(=27.34+73.34\)
\(=34\left(27+73\right)\)
\(=34.100\)
\(=3400.\)
c) \(125.98-125.46-52-25\)
\(=125\left(98-46\right)-52-25\)
\(=125.52-52-25\)
\(=52\left(125-1\right)-25\)
\(=52.124-25\)
\(=6448-25\)
\(=6423.\)
d) \(136.23+136.17-40.36\)
\(=136\left(23+17\right)-40.36\)
\(=136.40-40.36\)
\(=40\left(136-36\right)\)
\(=40.100\)
\(=4000.\)
e) \(66.25+5.66+66.14+33.94\)
\(=33\left(2.50+5.2+14.2+94\right)\)
\(=33\left(50+10+28+94\right)\)
\(=33.182\)
\(=6006.\)
\(\dfrac{x-13}{87}+\dfrac{x-27}{73}+\dfrac{x-67}{83}+\dfrac{x-73}{27}=4\)
<=>\(\dfrac{x-13}{87}-1+\dfrac{x-27}{73}-1+\dfrac{x-67}{83}-1+\dfrac{x-73}{27}-1=0\)
<=>\(\dfrac{x-100}{87}+\dfrac{x-100}{73}+\dfrac{x-100}{83}+\dfrac{x-100}{27}=0\)
<=>\(\left(x-100\right)\left(\dfrac{1}{87}+\dfrac{1}{73}+\dfrac{1}{83}+\dfrac{1}{27}\right)=0\)
Do \(\dfrac{1}{87}+\dfrac{1}{73}+\dfrac{1}{83}+\dfrac{1}{27}>0\)
=>x-100=0
<=>x=100
27.121-87.27+73.34
= 27( 121-87) +73.34
= 27. 34 +73.34
= 34( 27+73 )
= 34. 100
= 3400
27. 121 - 87. 27+ 73. 34
= 27 . (121 - 87 ) + 73. 34
= 27 . 34 + 73 .34
= 34 . ( 27 + 73 )
= 34 . 100 = 3400