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-
| ||||||
(1-
|
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.
(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-
×8,
=95.6×18-190.6×8
=1720.8-1524.8,
=196;
(3)(1-
×
)÷
,
=(1-
)÷
,
=
×
,
=
;
(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×
,
=(6.7+9.3)×
,
=16×
,
=4.
=7.32-1.32-3.8,
=6-3.8,
=2.2;
(2)95.6×18-
953 |
5 |
=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.
练习册系列答案
相关题目