(1)(8.5-4)×(0.32÷1.6)
=4.5×0.2,
=0.9;
(2)90.7×99+90.7
=(99+1)×90.7,
=100×90.7,
=9070;
(3)
×9-6÷7 15
15 7
=
×9-6×7 15
,7 15
=(9-6)×
,7 15
=3×
,7 15
=
;7 5
(4)
÷(13 18
+5 6
×2 3
)3 8
=
÷(13 18
+5 6
),1 4
=
÷(13 18
+10 12
),3 12
=
×13 18
,12 13
=
.2 3