问题
解答题
脱式计算.(能简算的要简算)
(
|
答案
(1)
×2 5
+1 4
×1 4 3 5
=(
+2 5
)×3 5 1 4
=1×1 4
=
;1 4
(2)(
+5 11
)×887 44
=
×88+5 11
×887 44
=40+14
=54;
(3)
×5 8
×12 31 8 5
=(
×5 8
)×8 5 12 31
=1×12 31
=
;12 31
(4)
×4 5
×15×216 7
=(
×15)×(4 5
×21)6 7
=12×18
=216.