问题
解答题
怎样算简便就怎样算. ①46×8-120÷15 ②
③6.28+7.13-(5.13+3.28) ④
⑤(12.5×8-40)÷0.6 ⑥(
|
答案
①46×8-120÷15,
=368-8,
=360;
②
×4 9
+6 7
÷7,4 9
=
×4 9
+6 7
×4 9
,1 7
=(
+6 7
)×1 7
,4 9
=1×
,4 9
=
;4 9
③6.28+7.13-(5.13+3.28),
=6.28+7.13-5.13-3.28,
=(6.28-3.28)+(7.13-5.13),
=3+2,
=5;
④
+(2 3
-4 5
)×2 3
,5 3
=
+2 3
×4 5
-5 3
×2 3
,5 3
=
+2 3
-4 3
,10 9
=2-
,10 9
=
;8 9
⑤(12.5×8-40)÷0.6,
=(100-40)÷0.6,
=60÷0.6,
=100;
⑥(
-5 12
+1 9
)×72,3 8
=
×72-5 12
×72+1 9
×72,3 8
=30-8+27,
=22+27,
=49.