18:2
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\(A=\left(\frac{2.18-1}{18}\right)\left(\frac{2.18-2}{18}\right)\left(\frac{2.18-3}{18}\right)....\left(\frac{2.18-35}{18}\right)\left(\frac{2.18-36}{18}\right)\left(\frac{2.18-37}{18}\right)...\left(\frac{2.18-100}{18}\right)\)
\(=\frac{35}{18}.\frac{34}{18}.\frac{33}{18}...\frac{1}{18}.\frac{0}{18}.\frac{-1}{18}...\frac{-64}{18}=0\)
a) 32 : 4 : 2 = 8 : 2 = 4
32 : 4 : 2 = 32 : 2 = 16
b) 18 : 2 x 3 = 18 : 6 = 3
18 : 2 x 3 = 9 x 3 = 18
Đáp án :
a) \(135+\left(-2\right).14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=135-28-135+28\)
\(=135-135+28-28=0\)
b) \(-18.2+18.\left(-6\right)+\left(-18\right).3\)
\(=18.\left(2+6+3\right)=18.11=198\)
a) \(135+\left(-2\right)\cdot14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=\left(135-135\right)+\left[\left(-28\right)+28\right]\)
\(=0+0\)
\(=0\)
b) \(-18\cdot2+18\cdot\left(-6\right)+\left(-18\right)\cdot3\)
\(=-18\cdot2+\left(-18\right).6+\left(-18\right).3\)
\(=-18\cdot\left(2+6+3\right)\)
\(=-18\cdot11\)
\(=-198\)
\(a)135+\left(-2\right).14-135+28\)
\(=135+\left(-28\right)-135+28\)
\(=135-135+\left(-28\right)+28\)
\(=0+0\)
\(=0\)
\(b)\left(-18\right).2+18.\left(-6\right)+\left(-18\right).3\)
\(=\left(-36\right)+\left(-108\right)+\left(-54\right)\)
\(=\left(-144\right)+\left(-54\right)\)
\(=\left(-198\right)\)
\(-18.2+18.\left(-6\right)+\left(-18\right).3\)
\(=-18.2+\left(-18\right).6+\left(-18\right).3\)
\(=-18.\left(2+6+3\right)\)
\(=-18.11\)
\(=-198\)
\(x\sqrt{18}-\sqrt{18}=x\sqrt{18}+4\sqrt{2}\\ \Rightarrow-3\sqrt{2}=4\sqrt{2}\left(vô.lí\right)\)
\(x\sqrt{18}-\sqrt{18}=x\sqrt{18}+4\sqrt{2}.\)
\(\Leftrightarrow x\sqrt{18}-\sqrt{18}-x\sqrt{18}=4\sqrt{2}.\)
\(\Leftrightarrow-3\sqrt{2}=4\sqrt{2}\) (vô lý).
Số cần tìm là :
18 : 2 = 9
Đáp số : 9.
=9
h dung cho minh