Toán a) 30.60+30.40+100.70 b) (-2)+(-1)+0+1+2 c) (-90)+(-10) 04/12/2021 By Savannah a) 30.60+30.40+100.70 b) (-2)+(-1)+0+1+2 c) (-90)+(-10)
a) 30.60+30.40+100.70 = 30.(60+40)+100.70 = 30.100+100.70 = 100.(30+70) =100.100 =10000 b) (-2)+(-1)+0+1+2 = [(-2)+2)+ [(-1)+1)+0 =0+0+0 =0 c) (-90)+(-10) = -(90+10) = -100 Trả lời
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a) 30.60+30.40+100.70
= 30.(60+40)+100.70
= 30.100+100.70
= 100.(30+70)
=100.100
=10000
b) (-2)+(-1)+0+1+2
= [(-2)+2)+ [(-1)+1)+0
=0+0+0
=0
c) (-90)+(-10)
= -(90+10)
= -100