题目内容
脱式计算.
800-22×33 | (62-19)×25 | 14×(57-39) |
25×32×125 | (15.26+3.74)×26 | 18.7+30.03-0.9. |
分析:(1)先算乘法,再算减法;
(2)(3)先算小括号里面的减法,再算括号外的乘法;
(4)先把32分解成4×8,再运用乘法结合律简算;
(5)先算小括号里面的加法,再算括号外的乘法;
(6)按照从左到右的顺序计算.
(2)(3)先算小括号里面的减法,再算括号外的乘法;
(4)先把32分解成4×8,再运用乘法结合律简算;
(5)先算小括号里面的加法,再算括号外的乘法;
(6)按照从左到右的顺序计算.
解答:解:(1)800-22×33,
=800-726,
=74;
(2)(62-19)×25,
=43×25,
=1075;
(3)14×(57-39),
=14×18,
=252;
(4)25×32×125,
=25×(4×8)×125,
=(25×4)×(125×8),
=100×1000,
=100000;
(5)(15.26+3.74)×26,
=19×26,
=494;
(6)18.7+30.03-0.9,
=48.73-0.9,
=47.83.
=800-726,
=74;
(2)(62-19)×25,
=43×25,
=1075;
(3)14×(57-39),
=14×18,
=252;
(4)25×32×125,
=25×(4×8)×125,
=(25×4)×(125×8),
=100×1000,
=100000;
(5)(15.26+3.74)×26,
=19×26,
=494;
(6)18.7+30.03-0.9,
=48.73-0.9,
=47.83.
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.
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