+ + +![]() | 12.04-5.37-4.63 |
+ + )×30; | ×[ ÷( × )] |
| 32×71.1+28.9×32 | ( + )÷( ÷4- ) |
+
+
+
,=(
)+(
),=1+1,
=2;
(2)12.04-5.37-4.63,
=12.04-(5.37+4.63),
=12.04-10,
=2.04;
(3)(
+
+
)×30,=
×30+
×30+
×30,=24+5+8,
=29+8,
=37;
(4)
×[
÷(
×
)],=
×[
÷
],=
,=
;(5)32×71.1+28.9×32,
=(71.1+28.9)×32,
=100×32,
=3200;
(6)(
+
)÷(
÷4-
),=
(
),=
,=7.5.
分析:(1)运用加法交换律和结合律即可解答,
(2)依据减法性质解答,
(3)(5)运用乘法分配律解答,
(4)(6)按照四则运算计算顺序解答.
点评:本题考查知识点:(1)四则运算计算顺序,(2)简便算法正确运用.