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a, 4 . 24 . 5 2 - 3 3 . 18 + 3 3 . 12
= 100.24–27.30
= 2400 – 810
= 1590
b, 2 3 . 7 . 5 3 - 5 2 . 65 + 5 2 . 35
= 7.1000 – 25.100
= 7000 – 2500
= 4500
c, 2 2 . 74 . 5 2 + 5 2 . 26 . 4 - 7000
= 100.74 + 100.26 – 70.100
= 100.(74+26–70)
= 100.30
= 3000
d, 55 . 2 2 . 5 + 4 . 89 . 5 2 - 3 2 . 10 3
= 25.4.11 + 4.25.89 – 90.100
= 100.11 + 100.89 – 100.90
= 100.(11+89–90)
= 100.10
= 1000
e, [(315+372).3+(372+315).7]:(26.13+74.13+74)
= [687.3+687.7]:(13.(26+74)+74)
= (687.10):(13.100+74)
= 6870:1374
= 5
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a) A=(5016 +912).37:13:74
A=5928.37:(13.74)
A=219336: 962
A=228
b) B=[(315+372).(3+7)]:(338+1036)
B=(687.10):1374
B=6870:1374
B=5
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a) 615 + 37 = 652
b) [ (315+372).3+1(372+315).7].(26.13+74.14)
= 687 .3 + 1 . 687 . 7 . (1002 + 1036)
= 687 . ( 3 + 7 ) . 1038
= 687 * 10 . 1038
= 6870 .. 1038
= 7131060
li-ke nha
\(A=\left(315+372\right).3+\left(372+315\right).7\) \(26.13+74+14\)
\(A=\left(315+372\right).\left(3+7\right)\) \(=338+74+14\)
\(A=\left(315+372\right).10\) \(=412+14\)
\(A=687.10=6870\) \(=126\)
1. \(A=\left(315+372\right)\cdot3+\left(372+315\right)\cdot7\)
\(\Rightarrow A=\left(315+372\right)\cdot\left(3+7\right)\)
\(\Rightarrow A=687\cdot10\)
\(\Rightarrow A=6870\)
2. \(26\cdot13+74+14\)
\(=338+74+14=426\)