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45 x 38 + 45 x 63 - 45
=45 x 38 + 45 x 63 -45 x 1
=45 x (38+63-1)
=45 x 100
=4500
\(\frac{21}{11}\)x \(\frac{22}{17}\)x\(\frac{68}{63}\)
= \(\frac{42}{17}\)x\(\frac{68}{63}\)
= \(\frac{8}{3}\)
18 - x : 2 = 16
x : 2 = 18 - 16
x = 2 x 2
x = 4
\(\frac{21}{11}\times\frac{22}{17}\times\frac{68}{63}\)
\(=\frac{21}{11}\times\frac{22\times68}{17\times63}\)
\(=\frac{21}{11}\times\frac{22\times4}{1\times63}\)
\(=\frac{21}{11}\times\frac{88}{63}\)
\(=\frac{21\times88}{11\times63}\)
\(=\frac{1\times8}{1\times3}\)
\(=\frac{8}{3}\)
\(18-x:2=16\)
\(x:2=18-16\)
\(x:2=2\)
\(x=2\times2\)
\(x=4\)
35 × 34 + 34 × 38 + 65 × 75 + 65 × 45
= 34 × (35 + 38) + 65 × (75 + 45)
= 34 × 73 + 65 × 120
= 2482 + 7800
= 10282
~Study well~
#KSJ
\(=25\%+25\%\times38+25\%\times50+25\%\times11\)
\(=25\%\times\left(1+38+50+11\right)=25\%\times100=25\)
a, \(\dfrac{12}{17}\) x \(\dfrac{21}{63}\) x \(\dfrac{51}{9}\)
= \(\dfrac{3\times4}{17}\) x \(\dfrac{3\times7}{9\times7}\) x \(\dfrac{17\times3}{9}\)
= \(\dfrac{4}{3}\)
74 x 35 + 63 x 70
= 37 x 2 x 35 + 63 x 70
= 37 x 70 + 63 x 70
= 70 x ( 37 + 63)
= 70 x 100
= 7000
17 x ( 38 + 50) - 38 x 17
= 17 x 38 + 17 x 50 - 38 x 17
= ( 17 x 38 - 38 x 17) + 17 x 50
= 17x( 38 - 38 ) + 850
= 17 x 0 + 850
= 850