计算:(1)8+(?14)?5?(?0.25)(2)-82+72÷36(3)712×134÷(?9+19)(4)25×34+(?25)×12+25×(?14)(
计算:(1)8+(?14)?5?(?0.25)(2)-82+72÷36(3)712×134÷(?9+19)(4)25×34+(?25)×12+25×(?14)(5)(?7...
计算:(1)8+(?14)?5?(?0.25)(2)-82+72÷36(3)712×134÷(?9+19)(4)25×34+(?25)×12+25×(?14)(5)(?79)÷214+49×(?29)(6)(?1)3?(1?12)÷3×[3?(?3)2](7)2(x-3)-3(-x+1)(8)-a+2(a-1)-(3a+5)
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2014-10-06
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(1)
8+(?)?5?(?0.25)=(8-5)+(-0.25+0.25)
=3+0
=3;
(2)-82+72÷36
=-82+2
=-80;
(3)
7×1÷(?9+19)=
×
÷10
=
;
(4)
25×+(?25)×+25×(?)=25×(
-
-
)
=25×0
=0;
(5)
(?79)÷2+×(?29)=-79×
+
×(-29)
=(-79-29)×
=-108×
=-48;
(6)
(?1)3?(1?)÷3×[3?(?3)2]=-1-
÷3×[3-9]
=-1-
÷3×[-6]
=-1+1
=0;
(7)2(x-3)-3(-x+1)
=2x-6+3x-3
=5x-9;
(8)-a+2(a-1)-(3a+5)
=-a+2a-2-3a-5
=-2a-7.
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