问题
解答题
计算题 ①(
②求未知数:
③8.6×8.6+8.6×
④1
|
答案
①(
-1 8
÷4×1 4
)÷1 4
,1 2
=(
-1 8
×1 4
×1 4
)×2,1 4
=(
-1 8
)×2,1 64
=
×2,7 64
=
;7 32
②
x+2 3
x-1 2
=0.5,2 3
x=7 6
+2 3
,1 2
x=7 6
,7 6
x=1.
③8.6×8.6+8.6×
+8.6,2 5
=(8.6+
+1)×8.6,2 5
=10×8.6,
=86.
④1
-1 3
+7 12
-9 20
+11 30
-13 42
,15 56
=1+
-1 3
+7 12
-9 20
+11 30
-13 42
,15 56
=1+
-1 3
+3+4 3×4
-4+5 4×5
+5+6 5×6
-6+7 6×7
,7+8 7×8
=1+
-1 3
-1 3
+1 4
+1 4
-1 5
-1 5
+1 6
+1 6
-1 7
-1 7
,1 8
=1-
,1 8
=
.7 8