题目内容

(2011?隆化县模拟)
脱式计算,能简算的要简算.
7.32-(3.8+1.32)

95.6×18-
953
5
×8
(1-
1
6
×
3
7
)÷
5
6
1.5÷〔1.2-(0.4+0.5)〕
0.125×2+6.6÷8-12.5% 6.7×0.25+9.3÷4.
分析:(1)根据减法的性质简算;
(2)把分数化成小数,然后同时运算乘法,再算减法;
(3)先算小括号里面的乘法,再算小括号里面的减法,最后算括号外的除法;
(4)先算小括号里面的加法,再算中括号里面的减法,最后算括号外的除法;
(5)(6)先把除法变成乘法,再运用乘法分配律简算.
解答:解:(1)7.32-(3.8+1.32),
=7.32-1.32-3.8,
=6-3.8,
=2.2;

(2)95.6×18-
953
5
×8,
=95.6×18-190.6×8
=1720.8-1524.8,
=196;

(3)(1-
1
6
×
3
7
)÷
5
6

=(1-
1
14
)÷
5
6

=
13
14
×
6
5

=
39
35


(4)1.5÷[1.2-(0.4+0.5)],
=1.5÷[1.2-0.9],
=1.5÷0.3,
=5;

(5)0.125×2+6.6÷8-12.5%,
=0.125×2+6.6×0.125-0.125,
=0.125×(2+6.6-1),
=0.125×7.6,
=0.125×8×0.95,
=1×0.95,
=0.95;

(6)6.7×0.25+9.3÷4,
=6.7×0.25+9.3×
1
4

=(6.7+9.3)×
1
4

=16×
1
4

=4.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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