(27+33)+(28+32)+(29+31)+26+30
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bận
26+27+28+29+30+31+32+33
\(=\left(33+27\right).\left[\left(33-27\right):1+1\right]:2\)
\(=60.7:2\)
\(=210\)
\(26+27+28+29+30+31+32+33\)
= \(26+\left(27+33\right)+\left(28+32\right)+\left(29+31\right)+30\)
= \(26+60+60+60+30\)
= \(26+60.3+30\)
= \(26+180+30\)
= \(236\)
Chúc bạn học tốt !!!
Ta lấy:
( 27 + 33 ) + ( 28 + 32 ) + ( 29 + 31 ) + 26 + 30 =100 + 100 + 100 + 26 + 30
= 300 + 26 + 30
= 326 + 30
= 356
26+27+28+29+30+31+32+33
=(26+30)+(27+33)+(28+32)+(29+31)
=56+60+60+60
=236
