考點(diǎn):分?jǐn)?shù)的四則混合運(yùn)算
專題:運(yùn)算順序及法則
分析:(1)(2)(3)根據(jù)等式的基本性質(zhì)解方程即可:等式的兩邊同時(shí)加上、減去同一個(gè)數(shù)等式仍然成立.
等式兩邊同時(shí)乘或除以同一個(gè)數(shù)(不為0)等式仍然成立.
(11)可根據(jù)乘法交換律計(jì)算.
其余算式根據(jù)分?jǐn)?shù)乘法與除法的運(yùn)算法則按從左到右的順序計(jì)算即可.
解答:
解:(1)
x-5=
x-5+5=5+
x=5
x
÷=5
÷ x=
(2)11x-
=
11x-
+
=
+
11x=
11x÷11=
÷11
x=
(3)6x=
÷ 6x=
6x÷6=
÷6
x=
(4)
×÷ =
×
=
;
(5)
×× =
×
=
;
(6)
÷×
=
×
=
;
(7)
÷÷ =
×
=
;
(8)
÷× =
×
=1;
(9)
÷×
=
×
=
;
(10)
÷÷ =
÷=12;
(11)
×10× =
×
×10
=1×10
=10;
(12)
÷÷=
×
=
.
點(diǎn)評(píng):完成本題要細(xì)心分析式中數(shù)據(jù),注意約分,能簡(jiǎn)便計(jì)算的要簡(jiǎn)便計(jì)算.