bai 1
tim cach thuan tien nhat ;
{a} 102+102-197
{b} 108+108-109
giup minh nha cac ban
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\(\dfrac{12}{7}\) \(\times\) \(\dfrac{3}{4}\) - \(\dfrac{3}{4}\) \(\times\) \(\dfrac{12}{7}\)
= \(\dfrac{9}{7}\) - \(\dfrac{9}{7}\)
= 0
A = \(2000-\left\{46-\left[24+74.4\right]:15\right\}\)
A = \(2000-\left\{46-\left[24+296\right]:15\right\}\)
A = \(2000-\left\{46-320:15\right\}\)
A = \(2000-\left(46-\frac{64}{3}\right)\)
A = \(2000-\left(\frac{138}{3}-\frac{64}{3}\right)\)
A = \(2000-\frac{74}{3}\)
A = \(\frac{6000}{3}-\frac{74}{3}\)
A = \(\frac{5926}{3}\)
23,4x 12,5 +12,5 x 75,6 + 12,5
23,4x 12,5 +12,5 x 75,6 + 12,5 x 1
12,5 x(23,4+75,6+1)
12,5 x 100
1250
23,4x12,5+12,5x75,6+12,5=12,5x(23,4+75,6+1)=12,5x100=1250
\(a,\dfrac{5}{9}\times\dfrac{5}{2}+\dfrac{4}{9}\times\dfrac{5}{2}=\dfrac{5}{2}\times\left(\dfrac{5}{9}+\dfrac{4}{9}\right)=\dfrac{5}{2}\times1=\dfrac{5}{2}\)
\(12\times\dfrac{3}{4}-\dfrac{3}{4}\times\dfrac{12}{7}=\dfrac{3}{4}\times\left(12-\dfrac{12}{7}\right)=\dfrac{3}{4}\times\dfrac{72}{7}=\dfrac{54}{7}\)
a) 3,78 x (200-68) - 3,78 x (100-68)
= 3,78 x 200 - 3,78 x 68 - 3,78 x 100 - 3,78 x 68
= 3,78 x (200-68-100-68)
= 3,78 x 100
= 378
\(\dfrac{1}{3}+\dfrac{6}{5}-\dfrac{1}{5}+\dfrac{2}{3}=2\)
a)102+102-197=204-197=7
b)108+108-109=216-109=107