Tính bằng cách thuận tiện nhất :
a: 27,32+36,23+45,14-15,14-6,23+22,68
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b: 254 x 399 - 145 / 254 + 399 x 253
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a: 27,32 + 36,23 + 45,14 - 15,14 - 6,23 + 22,68
= ( 27,32 + 22,68 ) + ( 36,23 - 6,23 ) + (45,14 - 15,14)
= 50 + 30 + 30
=50 +60
=110
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Mình cảm ơn!
