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a) 542 x 7 + 542 x 2 + 542
= 542 x 7 + 542 x 2 + 542 x 1
= 542 x (7 + 2 + 1)
= 542 x 10
= 5420
b) (126 x 35 + 157 x 55) x (132 - 6 x 22)
= (126 x 35 + 157 x 55) x (132 - 132)
= (126 x 35 + 157 x 55) x 0 (Số bất kỳ nào nhân với 0 vẫn = 0)
= 0
c) 897 x 99 + 897
= 897 x 99 + 897 x 1
= 897 x (99 + 1)
= 897 x 100
= 89700
a) \(542.7+542.2+542\)
\(=542.\left(2+7+1\right)\)
\(=542.10=5420\)
b) \(\left(126.35+157.55\right).\left(132-6.22\right)\)
\(=13045.0=0\)
c) \(897.99+897\)
\(=897.\left(99+1\right)\)
\(=897.100=89700\)
a: \(542\cdot7+542\cdot2+542\)
\(=542\left(7+2+1\right)\)
\(=542\cdot10=5420\)
b: \(\left(126\cdot35+157\cdot55\right)\cdot\left(132-6\cdot22\right)\)
\(=\left(126\cdot35+157\cdot55\right)\left(132-132\right)\)
\(=0\cdot\left(126\cdot35+157\cdot55\right)\)
=0
c: \(897\cdot99+897\)
\(=897\left(99+1\right)\)
\(=897\cdot100=89700\)
a) 4/5 x ( 5/4 - 5/7 )
= 4/5 x 15/28
= 21
b) 5/8 x 9/7 + 5/8 x 5/7
= 5/8 x ( 9/7 + 5/7 )
= 5/8 x 2
= 5/4
a, 4/5 x ( 5/4 - 5/7)
=(4/5 x 5/4)- (4/5-5/7)
=1-4/7
=3/7
b, 5/8 x 9/7 -5/8 x 5/7
=5/8 x (9/7 - 5/7 )
=5/8 x 4/7
=5/14
3/5 + 2/3 + 4/5
=19/15 + 4/5
=31/15
4/9 - 3/14 : 4/7
=4/9 - 3/8
=5/72
Nhớ tích mk nhé !
\(\frac{3}{5}+\frac{2}{3}+\frac{4}{5}=\left(\frac{3}{5}+\frac{4}{5}\right)+\frac{2}{3}\)
=\(\frac{7}{5}+\frac{2}{3}=\frac{21}{15}+\frac{10}{15}=\frac{31}{15}\)
\(\frac{4}{9}-\frac{3}{14}:\frac{4}{7}=\frac{4}{9}-\frac{3}{14}.\frac{7}{4}\)
=\(\frac{4}{9}-\frac{3}{8}=\frac{32}{72}-\frac{27}{72}=\frac{5}{72}\)
5162,75 nha
5162,75