Tinh nhanh : 37 ÷ 0.5 + 45 ÷ 0.2 + 3 × 18
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Phải là \(B=\frac{0,5-\frac{3}{17}+\frac{3}{37}}{\frac{5}{6}-\frac{5}{7}+\frac{5}{37}}+\frac{0,5-\frac{1}{3}+\frac{1}{4}-0,2}{\frac{7}{5}-\frac{7}{4}+\frac{7}{3}-3,5}\) chứ nhỉ?
Nếu đúng thì phân tích như sau
\(\Leftrightarrow B=\frac{\frac{3}{6}-\frac{3}{17}+\frac{3}{37}}{\frac{5}{6}-\frac{5}{7}+\frac{5}{37}}+\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}}{\frac{7}{5}-\frac{7}{4}+\frac{7}{3}-\frac{7}{2}}\)
\(B=\frac{3\left(\frac{1}{6}-\frac{1}{17}+\frac{1}{37}\right)}{5\left(\frac{1}{6}-\frac{1}{17}+\frac{1}{37}\right)}+\frac{\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}}{7\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}\right)}\)
\(B=\frac{3}{5}+\frac{1}{7}=\frac{16}{35}\)
1.25 ∶ 0.5 ∶ 0.2 x 8
=(1,25 x 8)x (0,5 x 2)
=10 x 1
= 10
132 : ( 0,125 + 0,25 - 0,2 + 0,5 + 1)
= 132 : 1,675
= 78,80
132: 0,125 + 132: 0,25 - 132: 0,2 + 132: 0,5 + 132
= 132 \(\times\) 8 + 132 \(\times\) 4 - 132 \(\times\) 5 + 132 \(\times\) 2 + 132 \(\times\) 1
= 132 \(\times\) ( 8 + 4 - 5 + 2 + 1)
= 132 \(\times\) ( 12 - 5 + 3)
= 132 \(\times\) ( 7 + 3)
= 132 \(\times\) 10
= 1320
18 + 45 + 76 + 98 + 34 + 56 + 12 + 37 + 39 + 21 + 87 + 45
= 568
k dùm nha ,mìn kho nhanh nhưng mong bn k mình k lại
HỨA ĐẤY Nguyen Trieu Anh Linh
1/Ta co :
\(\dfrac{15}{7}.\left(\dfrac{1}{5}-\dfrac{46}{45}\right)+\dfrac{46}{45}.\left(\dfrac{15}{7}-\dfrac{45}{46}\right)\)
=\(\dfrac{15}{7}.\dfrac{1}{5}-\dfrac{15}{7}.\dfrac{46}{45}+\dfrac{46}{45}.\dfrac{15}{7}-\dfrac{46}{45}.\dfrac{45}{46}\)
=\(\dfrac{15}{7}.\left(\dfrac{1}{5}-\dfrac{46}{45}+\dfrac{46}{45}\right)-1\)
=\(\dfrac{15}{7}.\dfrac{1}{5}-1\)
=\(\dfrac{3}{7}-1=\dfrac{-4}{7}\)
2/Ta co
\(\dfrac{43}{47}.\left(\dfrac{18}{37}+\dfrac{47}{43}\right)-\dfrac{18}{3}.\left(\dfrac{43}{47}+\dfrac{37}{36}\right)\)
=\(\dfrac{43}{47}.\dfrac{18}{37}+\dfrac{43}{47}.\dfrac{47}{43}-\dfrac{18}{37}.\dfrac{43}{47}+\dfrac{18}{37}.\dfrac{37}{36}\)
=\(\dfrac{18}{37}.\left(\dfrac{43}{37}-\dfrac{43}{37}+\dfrac{37}{36}\right)+1\)
=\(\dfrac{18}{37}.\dfrac{37}{36}+1\)
=\(\dfrac{1}{2}+1=\dfrac{3}{2}\)
tick cho mk nha
1/90:0.25+1/90:0.5+1/90:0.125-1/90:0.1
= 1/90 x 4 + 1/90 x 5 + 1/90 x 2 + 1/90 x 8 - 1/90 x 10
= 1/90 x ( 4+5+2+8-10)
= 1/90 x 9
= 1/10
k nha!Cảm ơn nhiều!
37 x 2 + 45 x 5 + 3 x 18 = 74 + 225 + 54
= 353