（1）3.75-2.76+1.25-1.04
=3.75+1.25-2.76-1.04
=5-（2.76+1.04）
=5-3.8
=1.2
（2）(6.74+6.74÷6.74-6.74）x6.74
=（6.74+1-6.74）×6.74
=（6.74-6.74+1）×6.74
=1×6.74=6.74
递等式计算（能巧算的要巧算） 3.75-2.76+1.25-1.04 (6.74+6.74÷6.74-6.74）x6.7
（1）3.75-2.76+1.25-1.04
=3.75+1.25-2.76-1.04
=5-（2.76+1.04）
=5-3.8
=1.2
（2）(6.74+6.74÷6.74-6.74）x6.74
=（6.74+1-6.74）×6.74
=（6.74-6.74+1）×6.74
=1×6.74=6.74