计算:
| 1.6×[1÷(2.1-2.09)] | 36÷[( - )×3] | (2 - )×( ÷ ) |
1÷[(8.5-4× )÷0.125] | 2.85×5 +5.2×3.15+5.2 |
=1.6×[1÷0.01],
=1.6×100,
=160;
(2)36÷[(
-
)×3],=36÷[
×3],=36÷1.5,
=24;
(3)(2
-
)×(
÷
),=2
,=2
;(4)1÷[(8.5-4×
)÷0.125],=1÷[(8.5-3.5)÷0.125],
=1÷[5÷0.125],
=1÷40,
=
;(5)2.85×5
+5.2×3.15+5.2,=5.2×(2.85+3.15+1),
=5.2×7,
=36.4.
分析:(1)(2)(3)(4)依据四则运算顺序:先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右计算,有括号先算括号里面的顺序解答,
(5)运用乘法分配律解答.
点评:本题考查知识点:(1)依据四则运算顺序正确进行计算,(2)正确运用乘法分配律解决问题.