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a) X x \(\frac{2}{5}\) < \(\frac{8}{10}\)
X = \(\frac{8}{10}\) - \(\frac{2}{5}\)
X = \(\frac{2}{5}\) . Vì là số tự nhiên nên X = 1
a,x*2/5<8/10
x<8/10:2/5
x<2
x=0,1
b,3/x*2>6/8
3/x>3/8
x<8
x=0,1,2,3,4,5,6,7
1.
\(\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1=1\)
\(\frac{2}{7}\cdot\frac{1}{5}+\frac{2}{7}\cdot\frac{4}{5}=\frac{2}{7}\cdot\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{2}{7}\cdot1=\frac{2}{7}\)
#Louis
\(1.a)\frac{5}{3}-\frac{1}{4}+\frac{1}{3}-\frac{3}{4}\)
\(=\left(\frac{5}{3}+\frac{1}{3}\right)-\left(\frac{1}{4}+\frac{3}{4}\right)\)
\(=2-1\)
\(=1\)
\(b)\frac{2}{7}\times\frac{1}{5}+\frac{2}{7}\times\frac{4}{5}\)
\(=\frac{2}{7}\times\left(\frac{1}{5}+\frac{4}{5}\right)\)
\(=\frac{2}{7}\times1\)
\(=\frac{2}{7}\)
\(2.a)\frac{5}{6}+\frac{7}{12}-\frac{2}{9}\)
\(=\frac{30}{36}+\frac{21}{36}-\frac{8}{36}\)
\(=\frac{43}{36}\)
\(b)\frac{4}{9}\times\frac{5}{8}+\frac{1}{6}\)
\(=\frac{5}{18}+\frac{1}{6}=\frac{5}{18}+\frac{3}{18}\)
\(=\frac{8}{18}=\frac{4}{9}\)
\(c)2:\frac{3}{11}-\frac{13}{12}\)
\(=2\times\frac{11}{3}-\frac{13}{12}\)
\(=\frac{22}{3}-\frac{13}{12}\)
\(=\frac{25}{4}\)
c)(145x99+145)-(143x102-143)
= 145x(99+1)-143x(101-1)
= 145x100-143x100
= (145-143)x100
= 2x100
= 200
a) \(x-\frac{4}{9}=\frac{5}{6}\)
\(\Leftrightarrow\frac{18x}{18}-\frac{8}{18}=\frac{15}{18}\)
\(\Rightarrow18x-8=15\)
\(\Leftrightarrow18x=15+8\)
\(\Leftrightarrow18x=23\)
\(\Leftrightarrow x=\frac{23}{18}\)
Vậy \(x=\frac{23}{18}\)
b)\(x-7=\frac{1}{6}\)
\(\Leftrightarrow\frac{6x}{6}-\frac{42}{6}=\frac{1}{6}\)
\(\Rightarrow6x-42=1\)
\(\Leftrightarrow6x=42+1\)
\(\Leftrightarrow6x=43\)
\(\Leftrightarrow x=\frac{43}{6}\)
Vậy \(x=\frac{43}{6}\)
c)\(x-\frac{7}{8}=11\)
\(\Leftrightarrow\frac{8x}{8}-\frac{7}{8}=\frac{88}{8}\)
\(\Rightarrow8x-7=88\)
\(\Leftrightarrow8x=88+7\)
\(\Leftrightarrow8x=95\)
\(\Leftrightarrow x=\frac{95}{8}\)
Vậy \(x=\frac{95}{8}\)
#bn cs thể bỏ\(\Leftrightarrow;\Rightarrow\)đều đc nhé #
#hoktot<3#
a, x - 4/9 = 5/6
x = 5/6 + 4/9
x = 69/54
b, x - 7 = 1/6
x = 1/6 + 7
x = 43/6
c, x - 7/8 = 11
x = 11 + 7/8
x = 95/8
a) 142 x 12 + 42 x 18 = 142 x (12 +18) = 142 x 30 = 4260
b) 49 x 365 – 39 x 365 = (49-39) x 365 = 10 x 365 = 3650
c) 4 x 18 x 25 = 18 x (4 x 25) = 10 x 100 = 1800
_k me_
@Min_ngu_ngục
_copy is not fun_
Tính bằng cách thuận tiện nhất :
a) 146 x 12 + 142 x 18
b) 49 x 365 - 39 x 365
c) 4 x 18 x 25
Bài giải
a) 142 x 12 + 142 x 18 = 142 x (12 + 18) = 142 x 30 = 4260
b) 49 x 365 – 39 x 365 = (49 – 39) x 365 = 10 x 365 = 3650
c) 4 x 18 x 25 = (4 x 25) x 18 = 100 x 18 = 1800
Chúc bạn học tốt nha!
Câu 1: 7m 12cm = 7,12m
Câu 2:
\(\frac{4}{15}:\frac{4}{7}< x< \frac{2}{5}\times\frac{10}{3}\)
\(\frac{7}{15}< x< \frac{4}{3}\)
\(\Rightarrow\)Ta tìm được giá trị x là 1
~Học tốt~
olm.vn/hoi-dap/detail/97548042619.html
\(4\cdot3,7\cdot2,5=4\cdot2,5\cdot3,7=10\cdot3,7=37\)
\(1,25\cdot0,7\cdot8=1,25\cdot8\cdot0,7=10\cdot0,7=7\)
\(3,2\cdot0,7+3,2\cdot0,2+3,2\cdot0,1=3,7\left(0,7+0,2+0,1\right)\)
\(=3,2\cdot10=32\)