(枯唤1)62.8×19-8×62
-624 5
,4 5
=62.8×(19-8-1),
=62.8×10,
=628;
(2)3.64×[1÷(2
-2.09)],1 10
=3.64×[1÷0.01],
=3.64×100,
=364;
(3)1800-1350÷18×6,
=1800-75×6,
=1800-450,
=1350;
(4)(2
+ 15 12
+25 8
+3.375)族败雹×7 12
,3 20
=(5+5)×
,3 20
=
;3 2
(5)1.9-1.9×(1.9-1.9),
=1.9-0,
=1.9;
(6)兆帆(1-1%×70)÷
,2 7
=(1-
)×7 10
,7 2
=
.21 20