问题
解答题
用递增式计算下列各题. ①914-316÷79×208 ②2.37+1.75+1.63+1.25 ③
④
|
答案
①914-316÷79×208
=914-4×208,
=914-832,
=82;
②2.37+1.75+1.63+1.25
=(2.37+1.63)+(1.75+1.25),
=4+3,
=7;
③
×9 20
+11 25
×14 25 9 20
=(
+11 25
)×14 25
,9 20
=1×
,9 20
=
;9 20
④
+(2 3
+1 2
)×2 3 2 7
=
+2 3
×7 6
,2 7
=
+2 3
,1 3
=1.