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10:2+15x3+2x(3x4-(15-2x3). 100x9-(62x(8+7:7-20:4):8+162. 10x(247+2x(205x100-20000. 10x(470:10+3x(475-399). 2x(2+(4+4x245):3). 7+8x5-(19-(5+4). 27-(10+7)-15:3)+28.

Răspuns :

5+45+2x(3x4-(15-6)=

5+45+2x3x4-9=
5+45+24-9=
50+24-9=
74-9=  65

100x9-(62x(8+7:7-20:4)=
100x9-(62x(8+1-5)=
100x9-62x4=
900-248=652

27-(10+7)-15:3)+28=
27-17-5+28=
10-5+28=
5+28=33

7+8x5-(19-(5+4)=
7+8x5-19-9=
7+40-10=
74-10=64