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1. 11 x 18 = 11 x 9 x 2 = 6 x 3 x 11;
15 x 45 = 45 x 3 x 5 = 9 x 5 x 15.
2. 17 x 4 = 17 x 2 x 2= 34 x 2 = 68;
25 x 28 = 25 x 4 x 7 = 100 x 7 = 700
3. 13 x 12 = 13 x (10+2)= 13 x 10 + 13 x 2=130 + 26 = 156
53 x 11 = 53 x (10+1) = 53 x 10 + 53 x 1= 530 + 53 = 583
39 x 101 = 39 x (100+1)=39 x 100 + 39 x 1 = 3900 + 39 = 3939
4. 8 x 19 = 8 x (20-1) = 8 x 20 - 8x1= 160 - 8 =152
65 x 98 = 65 x (100-2)= 65 x 100 - 65 x 2 = 6500 - 130 =6370.
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a: \(=23\cdot100+300=2600\)
b: \(=300:\left(4+6\right)-25=30-25=5\)
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\(x=\left[6\frac{3}{5}:6-0,125\cdot8+2\frac{2}{15}\cdot0,05\right]\cdot\frac{11}{4}\)
\(\Leftrightarrow x=\left[\frac{33}{5}:6-\frac{1}{8}\cdot8+\frac{32}{15}\cdot\frac{1}{20}\right]\cdot\frac{11}{4}\)
\(\Leftrightarrow x=\left[\frac{33}{5}\cdot\frac{1}{6}-\frac{1}{8}\cdot8+\frac{32}{15}\cdot\frac{1}{20}\right]\cdot\frac{11}{4}\)
\(\Leftrightarrow x=\left[\frac{11}{5}\cdot\frac{1}{2}-1+\frac{8}{15}\cdot\frac{1}{5}\right]\cdot\frac{11}{4}\)
\(\Leftrightarrow x=\left[\frac{11}{10}-1+\frac{8}{75}\right]\cdot\frac{11}{4}\)
\(\Leftrightarrow x=\left[\frac{1}{10}+\frac{8}{75}\right]\cdot\frac{11}{4}\)
Tính nốt đi nhé Nguyển Lương Hiếu
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Câu a )
\(-\frac{3}{5}+\frac{9}{16}+-\frac{2}{5}+\frac{7}{16}=\left(-\frac{3}{5}+-\frac{2}{5}\right)+\left(\frac{9}{16}+\frac{7}{16}\right).\)
\(=\left(-1\right)+1=0\)
hk tốt !
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\(\left(-\frac{1}{2}\right)^2\cdot2\cdot\frac{7}{4}\div\left(\frac{5}{8}-1\frac{3}{16}\right)\)
\(=\frac{1}{4}\cdot2\cdot\frac{7}{4}\div\left(\frac{10}{16}-\frac{19}{16}\right)\)
\(=\frac{7}{8}\div\left(-\frac{9}{10}\right)\)
\(=\frac{7}{8}\cdot\left(-\frac{10}{9}\right)\)
\(=-\frac{35}{36}\)
-1/2^2.7/4:(5/8-1 3/16)=1/4.7/4:(5/8-19/16)=1/4.7/4:(10/16-19/16)=1/4.7/4:-9/16=1/4.7/4.-16/9=1/4.-28/9=-7/9