①1375+450÷15×25,
=1375+30×25,
=1375+750,
=2125;
②1
-(3 7
+2 3
),3 7
=1
-3 7
-2 3
,3 7
=1
-3 7
-3 7
,2 3
=1?
,2 3
=
;1 3
③43×99+43,
=43×(99+1),
=43×100,
=4300;
④(68-
×2 9
)÷17,17 6
=(68-
×2 9
)÷17,17 6
=(68-
)×17 27
,1 17
=68×
-1 17
×17 27
,1 17
=4-
,1 27
=3
;26 27
⑤0.4×8×12.5×
,1 4
=0.4×8×12.5×0.25,
=(0.4×0.25)×(8×12.5),
=0.1×100,
=10;
⑥4-
÷(6 5
+1 4
),1 8
=4-
÷6 5
,3 8
=4-3
,1 5
=