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\(3.5.36+15.42+30.11\)
\(=15.36+15.42+15.\left(2.11\right)\)
\(=15.36+15.42+15.22\)
\(=15.\left(36+42+22\right)\)
\(=15.100=1500\)
3x5x36+15x42+30x11
=15x36+15x42+15x2x11
=15x36+15x42+15x22
=15x(36+42+22)
=15x100
=1500
112 + 50 +38
= ( 112 + 38 ) + 50
= 150 + 50
= 200
HT
456375+3956-56-375
=456375--375+3956-56
=456000+3900
= 4 59900
\(\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{75}{100}+\frac{40}{25}+\frac{20}{48}\)
\(=\frac{5}{4}+\frac{7}{12}+\frac{7}{5}+\frac{3}{4}+\frac{8}{5}+\frac{5}{12}\)
\(=\left(\frac{5}{4}+\frac{3}{4}\right)+\left(\frac{7}{12}+\frac{5}{12}\right)+\left(\frac{7}{5}+\frac{8}{5}\right)\)
\(=\frac{8}{4}+\frac{12}{12}+\frac{15}{5}\)
\(=2+1+3\)
\(=6\)
Đặt A=5/4 + 7/12 + 7/5 + 75/100 + 40/25 + 20/48
=>A=125/100 + 28/48 + 35/25 + 75/100 + 40/25 + 20/48
=>A=(125/100 + 75/100) + (28/48 + 20/48) + (35/25 + 40/25)
=>A= 2 + 1 + 3
=>A= 6
Vậy A=6
\(79\times11+2800\times40\)
\(=869+112000\)
\(=112869\)
7 x 5 x 36 + 35 x 42 + 35 x 22
= 35 x 36 +35 x 42 + 35 x 22
= 35 x ( 36 + 42 + 22 )
= 35 x 100
= 3500
Ta co 7*5*36+35*42+35*22
=35*36+35*42+35*22
=35*(36+42+22)=35*100
=3500 cho minh