题目内容
脱式计算
495÷15×26 | 26×(28+17) | (780-724)×15 |
(145+55)÷20 | 256-18-82 | 210+720÷30. |
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的乘法;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先算小括号里面的加法,再算括号外的除法;
(5)根据减法的性质简算;
(6)先算除法,再算加法.
(2)先算小括号里面的加法,再算括号外的乘法;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先算小括号里面的加法,再算括号外的除法;
(5)根据减法的性质简算;
(6)先算除法,再算加法.
解答:解:(1)495÷15×26,
=33×26,
=858;
(2)26×(28+17),
=26×45,
=1170;
(3)(780-724)×15,
=56×15,
=840;
(4)(145+55)÷20,
=200÷20,
=10;
(5)256-18-82,
=256-(18+82),
=256-100,
=156;
(6)210+720÷30,
=210+24,
=234.
=33×26,
=858;
(2)26×(28+17),
=26×45,
=1170;
(3)(780-724)×15,
=56×15,
=840;
(4)(145+55)÷20,
=200÷20,
=10;
(5)256-18-82,
=256-(18+82),
=256-100,
=156;
(6)210+720÷30,
=210+24,
=234.
点评:解决本题关键是找清楚运算的顺序,根据运算顺序逐步求解即可.
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