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(1)18.7-4.375-6.625,=18.7-(4.375+6.625),=18.7-11,

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(1)18.7-4.375-6.625,=18.7-(4.375+6.625),=18.7-11,
(1)18.7-4.375-6.625,
=18.7-(4.375+6.625),
=18.7-11,
=7.7;

(2)920÷40﹢23×50,
=23+23×50,
=23+1150,
=1173;

(3)12×(
1
4 +
1
6 -
1
3 ),
=12×
1
4 +12×
1
6 -12×
1
3 ,
=3+2-4,
=1;

(4)4.4×
3
4 +3.6÷1
1
3 +0.75×2,
=4.4×
3
4 +3.6×
3
4 +
3
4 ×2,
=
3
4 ×(4.4+3.6+2),
=
3
4 ×10,
=
15
2 .