①7.6-4.8+8.4-5.2,
=(7.6+8.4)-(4.8+5.2),
=16-10,
=6;
②4×0.8×2.5×1.25,
=(4×2.5)×(0.8×1.25),
=10×1,
=10;
③
×7 9
+13 14
÷2 9
,14 13
=
×7 9
+13 14
×2 9
,13 14
=(
+7 9
)×2 9
,13 14
=1×
,13 14
=
;13 14
④1375-375÷15×18,
=1375-25×18,
=1375-450,
=925;
⑤1.05×(3.8-0.8)÷6.3,
=1.05×3÷6.3,
=3.15÷6.3,
=0.5;
⑥
×[(6 5
-7 6
)÷4 9
],13 5
=
×[6 5
÷39 54
],13 5
=
×6 5
×39 54
,5 13
=
.1 3