Tính nhanh: 16 + (27-7.6) - (94.7-27.99)
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2003² - 2002.2003
= 2003.(2003 - 2002)
= 2003 . 1
= 2003
-------------------
7(x - 2) + 2³ = 2.5²
7(x - 2) + 8 = 2.25
7(x - 2) = 50 - 8
7(x - 2) = 42
x - 2 = 42 : 7
x - 2 = 6
x = 6 + 2
x = 8
-------------------
23 + (27 - 7.6) - (94.7 - 27.99)
= 23 + 27 - 42 - 658 + 2673
= 23 + (27 + 2673) - (42 + 658)
= 23 + 2700 - 700
= 23 + 2000
= 2023
\(A=\frac{2}{1.4}+\frac{2}{4.7}+\frac{2}{7.10}+...+\frac{2}{97.100}\)
\(A=2\left(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{97.100}\right)\)
\(A=2\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{97}-\frac{1}{100}\right)\)
\(A=2\left(1-\frac{1}{100}\right)\)
\(A=2.\frac{99}{100}=..............\)
Tự làm nốt nha
1.
`16 + (27 - 7.6 ) - (94 -7 - 27.99)`
`= 16+ 27 - 7.6 - 94 + 7 + 27.99`
`= 16 + 27(99 +1) - 7(6-1) - 94`
`= -78 + 27.100 - 7.5`
`= 2587`
2.
`A = 2/1.4 + 2/4.7 + 2/7.10 +...+ 2/97.100`
`A= 2(1/1.4 + 1/4.7 + 1/7.10 +...+1/97.100)`
`3A = 2 (3/1.4 + 3/4.7 + 3/7.10+...+ 3/97.100)`
`3/2 A = 1 - 1/4 + 1/4 - 1/7 +...+ 1/97 - 1/100`
`3/2A = 1 - 1/100`
`3/2 A= 99/100`
`A= 99/100 : 3/2`
`A=33/50`
Vậy `A= 33/50`
1.16+(27-7.6)-(94-7-27.99)=16+27-7.6-94+7+27.99
=(27+27.99)+(27+7-94)+16
=27.100-60+16
=2700-44=2656
2.A=\(\dfrac{2}{1.4}+\dfrac{2}{4.7}+\dfrac{2}{7.10}+...+\dfrac{2}{97.100}\)
=\(\dfrac{1}{1}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+...+\dfrac{1}{97}-\dfrac{1}{100}\)
=\(1-\dfrac{1}{100}=\dfrac{99}{100}\)
27(16-13)-16(27-13)
=27.16-27.13-16.27+16.13
=(27.16-16.27)+(-27.13+16.13)
=0+13(-27+16)
=0+13.-11
=0+-143=-143
a) - 36 . (16 - 41) - 16 . (41 - 36)
= -36.(-25)-16.5
= 900-80
= 820
b) - 15. (-27 + 30) - 27 . (30 - 15) - 30 . (5 - 27)
= -15.3-27.15-30.(-22)
= -45-405.(-660)
= (-450).(-660)
= 297000
=5.4+6.5+7.6+8.7-4.4-5.5-6.6-7.7
=(5,4 - 4,4)+(6,5-5,5)+(7,6-6.6)+(8,7-7,7)
=1+1+1+1
=4
16+(27-7.6)-94.7-27.99
=16+27-7.6-94.7-27.99
16+27(1+99)-7(6+94)=+2700-700=2016
đúng thì tk cho mk nha
2016 nha ban