1)=2/7×7/2×11=1×11==11
2)=5/11×11/5×5=1×5=5
3)=7/8×8/7×1,3=1×1,3=1,3
4)=10/11×1 1/10×12=10/11×11/10×12=1×12=12
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1)=2/7×7/2×11=1×11==11
2)=5/11×11/5×5=1×5=5
3)=7/8×8/7×1,3=1×1,3=1,3
4)=10/11×1 1/10×12=10/11×11/10×12=1×12=12