(1)15×43%+85×0.43
=15×0.43+85×0.43,
=(15+85)×0.43,
=100×0.43,
=43;
(2)
÷7 9
+11 5
×2 9
5 11
=
×7 9
+5 11
×2 9
,5 11
=(
+7 9
)×2 9
,5 11
=1×
,5 11
=
;5 11
(3)(
-1 2
)×1 3
÷25%3 8
=(
?3 6
)×2 6
÷3 8
,1 4
=
×1 6
×4,3 8
=
.1 4