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10 3/4+6 1/5=10 1/2×2/2+6 1/5=21/2+31/5=5×21+2×31/10=16 7/10
16 7/10-8 1/2=16 7/10-17/2=167-5×17/10=82/10=41×2/5×2=8 1/5
2).8 3/4+2 1/3×1/4
2 1/3 ×1/4=7/3×1/4=7×1/3×4=7/12
8 3/4+7/12=35/4+7/12=3×35+7/12=112/12=28/3=9 1/3
3).10,5÷2+1 1/4
10,5÷2= 105/20=21/4=5 1/4
5 1/4+1 1/4=21/4+5/4=21+5/4=26/4=13/2=6 1/2
4).7,25× 1 1/2-2,5
7,25× 1 1/2= 7,25×3/2=2175/200=87/8=10 7/8
10 7/8-2,5=87/8-2,5=335/40=67/8=8 3/8
5).6 7/5-3 1/4+0,125
6 7/5-3 1/4=37/5-13/4=83/20=4 3/20
4 3/20+0,125= 83/20+0,125=4275/1000=171/40=4 11/40