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c)34, 72 32,28 : 5 – 57,25 – 36, 05 : 2
=(34,72+32,28):5-(57,25-36,05):2
=67 : 5 - 21,2 : 2
=13,4 - 10,6
=2,8
e)5, 36.12, 34 ( 5, 36).2, 34
=5,36.12,34−5,36.2,34
=5.36.(12,34−2,34)
=5,36.10
=53,6
1) 12.2.25+29.25+59.25
=24.25+29.25+59.25
=25(24+29+59)
=25.112
=2800
2) 25.(231+69)+72.(231+69)
=25.300+72.300
=300(25+72)
=300.97
=29100
3) 39.(250+87)+64.(240+97)
=39.337+64.337
=337.(39+64)
=337.103
=34711
4) 36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110(36+64)
=110.100
=11000
1) 12 x 2 x 25 + 29 x 25 + 59 x 25
= 24 x 25 + 29 x 25 + 59 x 25
= 25 x ( 24 + 29 + 59 )
= 25 x 112
= 2800
2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )
= 25 x 300 + 72 x 300
= ( 25 + 72 ) x 300
= 29100
3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )
= 39 x 337 + 64 x 337
= ( 39 + 64 ) x 337
= 103 x 337
= 34711
tính nhanh
1) 12.2.25+29.25+59.25
2) 25.(231+69)+72.(231+69)
3) 39.(250+87)+64.(240+97)
4) 36.28+36.82+64.69+64.41
1) 12 x 2 x 25 + 29 x 25 + 59 x 25
= 24 x 25 + 29 x 25 + 59 x 25
= 25 x ( 24 + 29 + 59 )
= 25 x 112
= 2800
2) 25 x ( 231 + 69 ) + 72 x ( 231 + 69 )
= 25 x 300 + 72 x 300
= ( 25 + 72 ) x 300
= 29100
3)39 x ( 250 + 87 ) + 64 x ( 240 + 97 )
= 39 x 337 + 64 x 337
= ( 39 + 64 ) x 337
= 103 x 337
= 34711
24/-36.12/19 - 4/6.7/19 + 2022^0
= 24/36.-12/19 - 4/6.7/19 + 2022^0
=4/6.-12/19-4/6.7/19+1
=4/6.(-12/19-7/19)+1
=4/6.-1+1
=-4/6+1
=2/6
=1/3
\(36\cdot12+12\cdot65-12\)
\(=12\cdot\left(36+65-1\right)\)
\(=12\cdot\left(35+65\right)\)
\(=12\cdot100\)
\(=1200\)
36.12+12.65-12=36.12+12.65-12.1=(36+65-1).12=100.12=1200
\(\frac{1-1+2+9+8\cdot8}{x-36.12+5}=3615\)
\(\Rightarrow\frac{1-1+2+9+64}{x-432+5}=3615\)
\(\Rightarrow\frac{75}{x-427}=3615\)
\(\Rightarrow\left(x-427\right)3615=75\)
\(\Rightarrow3615x-1543605=75\)
\(\Rightarrow3615x=1543680\)
\(\Rightarrow x=\frac{1543680}{3615}=\frac{102912}{241}\)
36.82+36.12+36.3+72.4
=36.(82+12+3)+72.4
=36.103+72.4
đến đây dễ r
36 . 82 + 36 . 12 + 36 . 3 + 72 x 4
= 36 . (82 + 12 + 3 ) + 72 x 4
= 36 . 97 + 72 . 4
= 3492 + 288
= 3780