Toán Lớp 6: Tính bằng cách hợp kí
a,5.25.2.16.4
c,1+3+5+7+9…+2013
d,1+2+3+4+…+n
e,36.28+36.82+64.69+64.41
g,100+98+96+…+2-97-95-…1
f,2.3.12+4.6.42+8.27.3
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Toán Lớp 6: Tính bằng cách hợp kí
a,5.25.2.16.4
c,1+3+5+7+9…+2013
d,1+2+3+4+…+n
e,36.28+36.82+64.69+64.41
g,100+98+96+…+2-97-95-…1
f,2.3.12+4.6.42+8.27.3
Comments ( 2 )
=100+1+1+1+..+1
=(5.16).(25.4).2
=30.100.2
=3000.2
=6000
c)1+3+5+7+9…+2013
=(2001-1)+(1997+3)+…+(2013-13)
=2000+2000+…+20000
=2000.50
=100000
e)36.28+36.82+64.69+64.41
=36.(28+82)+64.(69+41)
=36.110+64.110
=110.(64+36)
=110.100
=11000
g)100+98+96+…+2-97-95-…1
=100+(98-97)+(96-95)+…+…+(2-1)
=100+1+1+1+..+1
=100+1.49
=100+49
=149
f)2.31.12+4.6.42+8.27.3
=24.31+24.42+24.27
=24.100
=2400