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= ( 2380 + 9 x 480) : 25 - 3500 : 25
= ( 2380 + 4320 - 3500 ) : 25
= 3200 : 25
= 128
a) \(\frac{2}{3}+\frac{5}{4}=\frac{8}{12}+\frac{15}{12}\)
\(=\frac{8+15}{12}=\frac{23}{12}\)
b) \(\frac{15}{25}+\frac{6}{21}=\frac{3}{5}+\frac{2}{7}\)
\(=\frac{21}{35}+\frac{10}{35}=\frac{31}{35}\)
c) \(\frac{35}{11}-2=\frac{35}{11}-\frac{22}{11}\)
\(=\frac{13}{11}\)
d) \(\frac{68}{17}-3=\frac{68}{17}-\frac{51}{17}\)
\(=1\)
(72x135+9x28x15):25-3500:25
=(72x135+28x135-3500):25
=((72+28)x135-3500):25
=(13500-3500):25
=10000:25=400
(72x135+9x28x15):25-3500:25
=(72x135+72x28):25-3500:25
=135x(72+28):25-3500:25
=135x100:25-3500:25
=13500:25-3500:25
=(13500-3500):25
=10000:25
=400
\(\frac{50}{150}=\frac{1}{3}\)
\(\frac{5}{20}=\frac{1}{4}\)
\(\frac{8}{32}=\frac{1}{4}\)
Sau đó bạn cứ rút gọn thôi,tích cho tớ nha
- \(\frac{1}{3}\)
- \(\frac{1}{4}\)
- \(\frac{1}{4}\)
- \(\frac{2}{3}\)
- \(\frac{2}{3}\)
- \(\frac{3}{2}\)
- \(\frac{3}{5}\)
- \(\frac{1}{2}\)
- \(\frac{18}{5}\)
- \(\frac{1}{4}\)
- \(\frac{1}{25}\)
- \(\frac{1}{8}\)
- \(\frac{1}{2}\)
- \(\frac{3}{7}\)
- \(\frac{2}{3}\)
- \(\frac{1}{3}\)
- k cho mk nha
\(\text{Ta có:}\)
\(\frac{8}{15}=\frac{8.5}{15.5}=\frac{40}{75}\)
\(\frac{6}{25}=\frac{6.3}{25.3}=\frac{18}{75}\)
\(\text{Vậy...}\)
Ta lay 72 * 135 duoc 9720
Roi ta lay 9 * 28 *15 duoc 3780
Ta cong 9720 va 3780 duoc 13500
Ta lay 13500 / 25 duoc 540
Ta lay 3500 / 25 duoc 140
Cuoi cung ta lay 540 - 140 bang 400
nhu vay ket qua la 400
ban doc xong nho ket ban voi minh nhe
= ( 5 + 95 ) + ( 15 + 85 ) + ( 25 + 75 ) + ( 35 + 65 ) + ( 45 + 55 )
= 100 + 100 + 100 + 100 + 100
= 5 x 100
= 500
d, X/8*32+X/3*18-X/5*10=120
X*32/8+X*18/3-X*10/5=120
32X/8+18X/3-10X/5=120
4X+6X-2X=120
8X=120
X=120/8
X=15
(68X75+5X32X150):25-5500:25
=(5100+160X150):25-5500:25
=(5100+24000):25-5500:25
=29100:25-5500:25
=1164-220
=994