tính nhanh
\(2018\times(\frac{1}{2}+\frac{1212}{2424}\))
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TÍNH NHANH :
2018 x {\(\frac{1212}{1212}\):\(\frac{2424}{2424}\)}
Trả lời:
\(2018\times\left(\frac{1212}{1212}\div\frac{2424}{2424}\right)\)
\(=2018\times\left(1\div1\right)\)
\(=2018\times1\)
\(=2018\)
Tính nhanh
\(2018\times\left\{\frac{1212}{1212}\div\frac{2424}{2424}\right\}\)
\(=2018\times1\)
\(=2018\)
2018×(1212/1212×2424/2424)
2018×1
2018
tính nhanh tổng sau :
\(\frac{121212}{141414}\)x \(\frac{1313}{1212}\)x\(\frac{2424}{2424}\)
\(\frac{121212}{141414}\times\frac{1313}{1212}\times\frac{2424}{2424}\)
\(=\frac{6}{7}\times\frac{13}{12}\times1\)
\(=\frac{13}{14}\)
~ Hok tốt ~
kết quả là ; 1313/141414
sau nhắc mik
=12. 10101/ 14.10101 . 13.101/12.101. 1
rút gọn ta được: 13/14
hok tốt
kt
b, 2018 x ( \(\dfrac{1}{2}\) + \(\dfrac{1212}{2424}\) )
=2018
Chi tiết
2018X(1/2+1212/2424)
Rút gon 1212/2424 còn 1/2
1/2+1/2=1
Vậy 2018x1=2018
\(=2018\) x \(\left(\dfrac{1}{2}+\dfrac{1}{2}\right)\)
\(=2018\) x \(1=2018\)
câu 10 Tính nhanh
a) 3/5 x 6/7 + 3/5 : 7 + 6/5
b) 2018x ( 1/2 + 1212/2424 )
a, \(\dfrac{3}{5}\) \(\times\) \(\dfrac{6}{7}\) + \(\dfrac{3}{5}\) : 7 + \(\dfrac{6}{5}\)
= \(\dfrac{3}{5}\) \(\times\) \(\dfrac{6}{7}\) + \(\dfrac{3}{5}\) \(\times\) \(\dfrac{1}{7}\) + \(\dfrac{6}{5}\)
= \(\dfrac{3}{5}\) \(\times\) ( \(\dfrac{6}{7}\) + \(\dfrac{1}{7}\)) + \(\dfrac{6}{5}\)
= \(\dfrac{3}{5}\) + \(\dfrac{6}{5}\)
= \(\dfrac{9}{5}\)
b, 2018 \(\times\) ( \(\dfrac{1}{2}\) + \(\dfrac{1212}{2424}\))
= 2018 \(\times\) ( \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\))
= 2018 \(\times\)1
= 2018
a) 3/5 x 6/7 + 3/5 x 1/7 + 6/5
3/5 x ( 6/7 + 1/7 ) + 6/5
3/5 x 7/7 + 6/5
3/5 x 1 + 6/5
3/5 + 6/5
9/5
b) 2018 x ( 1/2 + 1212/ 2424 )
2018 x ( 1/2 + 12/24 )
2018 x ( 1/2 + 1/2 )
2018 x 2/2
2018 x 1
2018
Học tốt
CAU HOI NAY VIET THIEU, VIET LAI
TINH BANG CACH THUAN TIEN NHAT
2018 * {1/2 + 1212/2424 }
Ta có:
\(\frac{1212}{2424}=\frac{1}{2}\)
\(\Rightarrow2018.\left(\frac{1}{2}+\frac{1}{2}\right)=2018.1=2018\)
chia 101/101 để ra được 1/2
TINH BANG CACH THUAN TIEN NHAT
2018 * { 1212/2424 }
\(2018.\frac{1212}{2424}=2018.\frac{1212:1212}{2424:1212}=2018.\frac{1}{2}=1009\)
~Study well~
#ARMY_BLINK#
Trả lời:
2018 * ( 1212/2424 )
= 2018 * 1/2
= 1009
~~GOD~~
\(2018x\frac{1212}{2424}=2018x\frac{1212:1212}{2424:2424}=2018x\frac{1}{2}=1009\)
MAGCIEPCNIL
HÃY LUÔN ;-)
Bài 1: Tính nhanh
a) \(\frac{1111+1212+1313+1414+1515+1616}{2020+2121+2222+2323+2424+2525}\)
b) \(\frac{5,4:0,4\cdot1420+4,5\cdot780\cdot3}{3+6+9+12+......+24+27}\)
c) \(\frac{7,2:2\cdot28,6+1,43\cdot2\cdot64}{2+2+4+6+10+16+......+110}\)
Bài 2: Tính tổng
D = 1 x 2 + 2 x 3 + 3 x 4 + ...... +99 x 100
tính A biết
A=\(\left(\frac{1}{1+2}-1\right)\times\left(\frac{1}{1+2+3}-1\right)\times\left(\frac{1}{1+2+3+4}-1\right)\times...\times\left(\frac{1}{1+2+3+4+...+2018}-1\right)\)
Giúp mình nhanh nha các bạn
bài 1: Tính biểu thức 1 cách hợp lý\(\frac{1010+1111+1212+1313+1414+1515+1616+1717}{2020+2121+2222+2323+2424+2525+2626+2727}\)
bài 2: Tím y là số tự nhiên
\(2< \)( \(\frac{1}{6}+\frac{2}{15}+\frac{3}{40}+\frac{4}{96}\)):5 x y \(< \frac{5}{6}\)
\(\frac{1010+1111+1212+1313+1414+1515+1616+1717}{2020+2121+2222+2323+2424+2525+2626+2727}\)
\(=\frac{101.10+101.11+...+101.17}{101.20+101.21+...+101.27}\)
\(=\frac{101.\left(10+11+...+17\right)}{101.\left(20+21+...+27\right)}\)
\(=\frac{108}{188}\)
\(=\frac{27}{47}\)
\(2>\left(\frac{1}{6}+\frac{2}{15}+\frac{3}{40}+\frac{4}{96}\right)\cdot5.y>\frac{5}{6}\)
\(\Rightarrow2>\left(\frac{1}{6}+\frac{2}{15}+\frac{3}{40}+\frac{1}{24}\right):5.y>\frac{5}{6}\)
\(\Rightarrow2>\left(\frac{20}{120}+\frac{16}{120}+\frac{9}{120}+\frac{5}{120}\right):5.y>\frac{5}{6}\)
\(\Rightarrow2>\frac{5}{12}:5.y>\frac{5}{6}\)
\(\Rightarrow2>\frac{1}{12}.y>\frac{5}{6}\)
Đặt :\(\frac{1}{12}.y=2\Rightarrow y=2:\frac{1}{12}=24\)
\(\frac{1}{12}.y=\frac{5}{6}\Rightarrow y=\frac{5}{6}:\frac{1}{12}=10\)
\(\Rightarrow24>y>10\)
\(\Rightarrow y\in\left\{11;12;...;23\right\}\)