问题
解答题
脱式计算: (21.9-8.4×2.5)÷3; 326+9664÷32×12; (
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答案
(1)(21.9-8.4×2.5)÷3,
=(21.9-21)÷3,
=0.9÷3,
=0.3;
(2)326+9664÷32×12,
=326+302×12,
=326+3624,
=3950;
(3)(
-11 15
)÷2 3
×5 8
,2 5
=
×1 15
×8 5
,2 5
=
×8 75
,2 5
=
;16 375
(4)
÷[1 6
×(9 14
-5 6
)],4 9
=
÷[1 6
×9 14
],14 36
=
÷1 6
,1 4
=
.2 3