(1)[11.4-(9.1× 6 7 +1.2)]÷1 3 5 +1÷0.25,
=[11.4-(7.8+1.2)]÷1 3 5 +1÷0.25,
=[11.4-9]÷1 3 5 +1÷0.25
=2.4÷1 3 5 +1÷0.25,
=1.5+4,
=5.5;
(2)4 1 2 ÷[2 2 5 -( 3 4 ×1 1 3 +0.4)]-1.75,
=4 1 2 ÷[2 2 5 -(1+0.4)]-1.75,
=4 1 2 ÷[2 2 5 -1.4]-1.75,
=4 1 2 ÷1-1.75,
=4.5-1.75,
=2.75.
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