B= 53.39+47.39+53.21-47.21
= ( 53+47).39 + (53+47).21
= 100.39+100.21
= 100.(39+21)= 100.60=6000
tich cho minh nha
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B= 53.39+47.39+53.21-47.21
= ( 53+47).39 + (53+47).21
= 100.39+100.21
= 100.(39+21)= 100.60=6000
tich cho minh nha
53.39+47.39-53.21-47.21
53.39+47.39-53.21-47.21
53.39-47.39-53.21-47.21
Tính :a,1+(-3)+5+(-7)+...+72 b, 53.39+47.39-53.21-47.21
tinh nhanh:53.39+47.39-53.21-47.21
53.39+47.39-53.21-47.21
Giúp mình nha !!!
Tính nhanh:
a)53.39+47.39-53.21-47.21
b)2.53.12+4.6.87-3.8.40
c)3.7.77-7.60+49.25-15.42
thực hiện phép tính
166.(-127+234)-234.(166+127)
53.39+47.39-53.21-47.21
tính nhanh
53.39+47.39+53.21+47.21
2.53.12+4.6.87 -3.8.40
5.7.77-7.60+49.25-12.42