问题
解答题
①45×8-240÷15 ②(2.5-2.5×0.6)÷0.4 ③41.2-9.5×1.8÷0.45 ④(
⑤
⑥
|
答案
①45×8-240÷15,
=360-16,
=344;
②(2.5-2.5×0.6)÷0.4,
=(2.5-1.5)÷0.4
=1÷0.4,
=2.5;
③41.2-9.5×1.8÷0.45,
=41.2-17.1÷0.45,
=41.2-38,
=3.2;
④(
+1 4
-1 9
)×72,1 12
=
×72+1 4
×72-1 9
×72,1 12
=18+8-6,
=26-6,
=20;
⑤
÷8 15
-1 6
×6,7 15
=
×6+8 15
×6,7 15
=(
+8 15
)×6,7 15
=1×6,
=6;
⑥
÷[(7 10
-3 5
)×12],1 4
=
÷[7 10
×12],7 20
=
÷7 10
,21 5
=
×7 10
,5 21
=
.1 6