Pertanyaan bonus! 1. Matematika a. 21 + 15 - 20 +21 = b. 45 x 2 : 30 = c. 55 : 5 + 19 =

a) (21+15)-20+21
=36-20=16+21=37
b) 45x2 ÷30 =90÷30 =3
c) (55÷5)+19 =11+19 = 30
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1.21+15-20+21 =36-20+21 =16+21 =37
2.45×2:30 = 90:30= 3
3. 55:5+19= 11+19= 30