27.2+27.8+2.3
=27.(8+2)+6
=27.10+6
=270+6
=276
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27.2+27.8+2.3
=27.(8+2)+6
=27.10+6
=270+6
=276
tinh nhanh
2.3+2.4+2.3=
36-2.3:6-1=?
tính nhanh 1.2+2.3+1.2+3.5
tìm z
16:z=2.3-1.9
tinh 1/1.2+1/2.3+1/3.4+.......+1/99.100
S=2/1.2+2/2.3+2/3.4+2/4.5+.........2/101.102
Tính B
B=1/2.3 + 1/3.4 + 1/5.6 + ........ + 1/99.100
TINH
1/1.2+1/2.3+......+1/99.100
TICK MK NHA M BN
mn giup tui vs
a . 6 + a = 420
240 ( a . 3 + a . 5 ) = 2.3