A= 2.53.12+4.6.87-3.8.80
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đề sai rùi bn ơi, đáng ra phải là: 53.39+37.39....... mới đúng
kết quả là 4200

= 39(53 + 47) - 21(53 + 47) + 24.53 + 24.87 - 24.40
= (53 + 47)(39 - 21) + 24(53 + 87 - 40)
= 100.18 + 24.100
= 100(18 + 24)
= 100.42 = 4200

b,5.7.77-7.60+49.25-15.42
=35.77-35.12+35.35-35.18
=35(77-12-35-18)
=35.12
=420
tick nha

a,5.7.77-7.60+7.7.25-15.6.7
=7.385-7.60+175.7-90.7
=7.(385-60+175-90)
=7.410
=2870


a: \(2\cdot53\cdot12+4\cdot6\cdot87-3\cdot8\cdot40\)
\(=24\left(53+87-40\right)\)
=2400
b: \(5\cdot7\cdot77+7\cdot60+49\cdot25-45\cdot42\)
\(=35\cdot77+35\cdot12+49\cdot25-45\cdot42\)
\(=35\cdot89+35\left(7\cdot5-9\cdot6\right)\)
\(=35\cdot70=2450\)
a) 2.53.12+4.6.87-3.8.40
=24.53+24.87-24.40
=24.(53+87-40)
=24.100
=2400
b) 5.7.77-7.60+49.25-45.42
=5.7.77-7.60+7.7.25-45.6.7
=7.(5.77-60+7.25-6.45)
=7.230
=1610

a, 53 x 39 + 47 x 39 - 53 x 21 - 47 x 21
= 53 x (39-21) + 47 x (93-21)
=53 x 18 + 47 x 18
= (53 +47) x 18
= 100 x18
=1800
b,2 x 53 x 12 + 4 x 6 x 87 - 3 x 8 x 40
=24 x 53 + 24 x 87 - 24 x 40
=24 x (53+87-40)
=24 x 100 =2400
c,5 x 7 x 77 - 7 x 60 +49 x 25 -15 x 42.
=5 x 7 x 77 - 7 x 5 x 12 +49 x 5 x 5 - 5 x 3 x 42.
=5 x 539 - 84 x 5 +245 x 5 -5 x 126
=5 x (539 - 84 +245 -126)
=5 x 574
=2870
\(a,53\cdot39+47\cdot39-53\cdot21-47\cdot21\)
\(=39\cdot\left(53+47\right)-21\cdot\left(53+47\right)\)
\(=39\cdot100-21\cdot100\)
\(=100\cdot\left(39-21\right)=100\cdot18\)
\(=1800\)
\(b,2\cdot53\cdot12+4\cdot6\cdot87-3\cdot8\cdot40\)
\(=24\cdot53+24\cdot87-24\cdot40\)
\(=24\cdot\left(53+87-40\right)\)
\(=24\cdot100=2400\)

\(2.53.12+4.6.87-3.8.40=24.53+24.87-24.40=24.\left(53+87-40\right)=24.100=2400\)
2.53.12 + 4.6.87 - 3.8.40
= (2.12).53 + (4.6).87 - (3.8).40
= 24.53 + 24.87 - 24.40
= 24. (53 + 87 - 40)
= 24.100
= 2400
A=2.53.12+4.6.87-3.8.80
=(2.12).53+(4.6).87-(3.8).80
=24.53+24.87-24.80
=24.(53+87-80)
=24.60
=1440
\(A=2\cdot53\cdot12+4\cdot6\cdot87-3\cdot8\cdot80\)
\(A=\left(2\cdot12\right)\cdot53+\left(4\cdot6\right)\cdot87-\left(3\cdot8\right)\cdot80\)
\(A=24\cdot53+24\cdot87-24\cdot80\)
\(A=24\cdot\left(53+87-80\right)\)
\(A=24\cdot60\)
\(A=1440\)