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Goats : 1200 - 125 - 89 = 986
How much goats more than cats : 986 - 125 = 861
Answer : 861
k mình nhé
Chúc bạn học giỏi
Cảm ơn bạn nhiều
\(\frac{48x700-24x45x20}{45-40+35-30+25-20+15-10}\)
\(=\frac{24x2x700-24x45x20}{5+5+5+5}\)
\(=\frac{24x1400-24x900}{20}\)
\(=\frac{24x\left(1400-900\right)}{20}\)
\(=\frac{24x500}{20}\)
\(=\frac{12000}{20}\)
\(=600\)
k nha
\(\frac{27x45+27x55}{2+4+6+...+16+18}\)
\(=\frac{27x\left(45+55\right)}{2+4+6+...+16+18}\)
\(=\frac{27x100}{2+4+6+...+16+18}\)
\(=\frac{2700}{\left(2+18\right)x9:2}\)
\(=\frac{2700}{90}\)
\(=30\)
k nha
4+8+12+16+20+24+28
= (16+24)+(28+12)+20+4+8
= 40+40+20+12
= 112
(4 + 16 )+ (8 + 12) + 20 + 28 + 24
= 20 + 20 + 20 + 52
= 112
a) \(A=\frac{27\text{x}45+27\text{x}25}{2+4+6+8+...+18}=\frac{27\left(45+25\right)}{\left(18+2\right)\text{x}\left(\frac{18-2}{2}+1\right)}\)
\(A=\frac{27\text{x}70}{20\text{x}9}=\frac{3\text{x}9\text{x}10\text{x}7}{10\text{x}2\text{x}9}\)
\(A=\frac{21}{2}\)
b) \(B=\frac{28\text{x}108-52\text{x}12}{32-28+24-20+16-12+8-4}\)
\(B=\frac{28\text{x}12\text{x}9\text{}\text{}-52\text{x}12}{\left(32-28\right)+\left(24-20\right)+\left(16-12\right)+\left(8-4\right)}\)
\(B=\frac{12\left(28\text{x}9-52\right)}{4+4+4+4}=\frac{12\text{x}200}{4\text{x}4}\)
\(B=\frac{4\text{x}3\text{x}4\text{x}50}{4\text{x}4}=150\)
b, 3/5 + 4/7 + 2/8 + 10/25 + 9/21 + 28/16
= 3/5 + 4/7 + 2/8 + 2/5 + 3/7 + 14/8
= (3/5 + 2/5) + ( 4/7 + 3/7) + ( 2/8 + 14/8)
= 1 + 1 + 7/4
= 2 + 7/4 = 15/4
c , 8/7 + 7/6 + 5/8 + 10/12 + 24/28 + 6/16
= c , 8/7 + 7/6 + 5/8 + 5/6 + 6/7 + 1/2
= (8/7 + 6/7) + (7/6 + 5/6) + 5/8 + 1/2
= 14/7 + 12/6 + 5/8 + 1/2
= 2 + 2 + 5/8 + 1/2
= 4 + 9/8 = 41/8
Lời giải:
$1+2+3+....+25$
$=(1+25)+(2+24)+(3+23)+(4+22)+(5+21)+(6+20)+(7+19)+(8+18)+(9+17)+(10+16)+(11+15)+(12+14)+13$
$=\underbrace{26+26+26+...+26}_{12}+13$
$=26\times 12+13=325$
sai chính tả xem lại nhé!!
12 + 16 + 48 + 72 + 64+80+96+56=444 legs