问题
解答题
计算下列各题,要写出主要计算过程,能用简便方法的要用简便方法计算.
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答案
①16×18-120÷15,
=288-8,
=280;
②3.2×2.77+0.23×3.2,
=3.2×(2.77+0.23),
=3.2×3,
=9.6;
③7.6-2.05÷0.82,
=7.6-2.5,
=5.1;
④
-7 8
+5 17
-9 8
,12 17
=(
+7 8
)-(9 8
+5 17
),12 17
=2-1,
=1;
⑤
-2 9
×7 16
,2 9
=
×(1-2 9
),7 16
=
×2 9
,9 16
=
;1 8
⑥13÷(
+1 4
)×5 6
,3 4
=13÷
×13 12
,3 4
=12×
,3 4
=9.