Toán Lớp 5: a) 30.72+30+28
b) 90.10+90.90-90.100
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Toán Lớp 5: a) 30.72+30+28
b) 90.10+90.90-90.100
Comments ( 2 )
= 30.(72+28)
=30.100
=3000
b) 90.10+90.90-90.100
=90.(10+90-100)
=90.0
=0