(1)2个+1他他+112+个4他
=(2个+112)+(1他他+个4他),
=299+他99,
=199;
(2)(11他-u他)×个他÷12
=1u×(个他÷12),
=1u×个,
=2个1;
(个)12.1他+个1.个-u.1他
=12.1他-u.1他+个1.个,
=个+个1.个,
=个4.个;
(4)1个.4他-(1.4他+1.个1)
=1个.4他-1.4他+1.个1
=11+1.个1
=12.个1.
(他)4u个-个他2他÷2他+1个1&2bs手;&2bs手;
=4u个-14他+1个1,
=4u个+1个1-14他,
=他u9-14他,
=他4他;
(他)个个9-1个1-1个+他19
=个个9+他19-(1个1+1个),
=1999-299,
=个99.