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2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4
= (2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 )+(3 + 3 + 3 + 3 + 3 + 3 + 3 + 3)+ ( 4 x 4 )+ (4 + 4 + 4 )
= 16 + 24 + 16 + 12
= 88
mk ko pít đúng hay sai nữa nhưng pạn k cho mk nha pạn
2+2+2+2+2+2+2+2+3+3+3+3+3+3+3+3+4+4x4+4+4
trả lời ......
99.9% làm sai
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4
= (2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 )+(3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 4 + 4 x 4 + 4 + 4 )
= 16 + 56
=72
a) \(\frac{12}{25}+\frac{3}{5}+\frac{134}{25}=\left(\frac{12}{25}+\frac{134}{25}\right)+\frac{3}{5}=\frac{146}{25}+\frac{3}{5}=\frac{146}{25}+\frac{15}{25}=\frac{161}{25}\)
b) \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)=\frac{3}{2}+\frac{6}{3}=\frac{9}{6}+\frac{12}{6}=\frac{21}{6}=\frac{7}{2}\)
c) \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}=\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}=\frac{10}{5}+\frac{3}{4}=2+\frac{3}{4}=\frac{8}{4}+\frac{3}{4}=\frac{11}{4}\)
a,\(\frac{12}{25}+\frac{3}{5}+\frac{134}{25}=\frac{12}{25}+\frac{15}{25}+\frac{134}{25}=\frac{161}{25}\)
b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)=\frac{3}{2}+\frac{6}{3}=\frac{3}{2}+2=\frac{7}{2}\)
c, \(\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}=\frac{10}{5}+\frac{3}{4}=2+\frac{3}{4}=\frac{11}{4}\)
3(1/2+1/4+1/8+1/16.....1/128)
A=(1/2+1/4+1/8+1/16....1/128)
2A-A=A
2A=(1/2+1/4+1/8....1/128)*2
=1+1/2+1/4....1/64
2A-A=1+1/2+1/4+1/8....1/64-(1/2+1/4+1/8......1/128)
A=1-1/128=127/128
Đáp số:3*127/128=381/128
4/7 x 5/3 = 20/21
6/7 : 3/2 = 4/7
11/12 : 1/6 = 11/2
2/3:+3/4+1/6 ??? cả chia cả cộng ???
15/10 - 3/4 + 5/9 x 3/7 = 83/84
4/7*5/3=20/21
6/7:3/2=4/7
11/12:1/6=11/2
2/3:+3/4+1/6=19/18
15/10-3/4+5/9*3/7=83/84
Ta có
\(B=3+3^2+...+3^{10}=\left(3+3^2\right)+\left(3^3+3^4\right)+...+\left(3^9+3^{10}\right)\)
\(=3.4+3^3.4+...+3^9.4=4\left(3+3^3+...+3^9\right)\)chia hết cho 9
63*2/3=42
126/3 hay 42
cách làm:63 x 2/3 = 126/3 = 126 : 3 = 42