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3x1x1/2=1,5
25-(4x1,5)=25-6=19
b) 8x5=40
3x3x1/2=4,5
2x8x1/2=8
4x5x1/2=10
40-(10+8+4,5)=40-22,5=17,5
c) 5x8=40
3x3x1/2=4,5
2x5x1/2=5
2x6x1/2=6
40-(6+5+4,5)=40-15,5=24,5