Bài 1:Tính bằng hai cách
a, ( 426 + 813 ) : 3
Cách 1: Cách 2:
.................................. .......................................
.................................. ........................................
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b, ( 2350 + 435 ) : 5
Cách 1: Cách 2:
.................................... ..........................................
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...................................... .........................................
a, ( 426 + 813 ) : 3
Cách 1: Cách 2:
=1239:3 =426:3+813:3
=413 =142+271
=413
b, ( 2350 + 435 ) : 5
Cách 1: Cách 2:
=2785:5 =2350:5+435:5
=557 =470+87
=557
