问题
解答题
计算下面各题,能简算的要简算.
|
答案
①
+3 8
×5 8
+2 5
,3 4
=
+3 8
+1 4
,3 4
=
+(3 8
+1 4
),3 4
=1
;3 8
②26×(
-5 13
)÷2 15
,1 30
=26×30×
-26×30×5 13
,2 15
=300-104,
=196;
③(
-4 9
+5 12
)÷2 3
,1 36
=(
-4 9
+5 12
)×36,2 3
=
×36-4 9
×36+5 12
×36,2 3
=16-15+24,
=25;
④
×16 19
+5 17
×12 19
+3÷19,16 17
=
+80 323
+192 323
,3 19
=
+272 323
,3 19
=
+272 323
,51 323
=
,323 323
=1.