题目内容
脱式计算,怎样算简便就怎样算.
153÷17+32×6 | 812÷(532-36×14) | 83×29+17×29 |
99×64 | 245-148-52 | 350÷42. |
解:(1)153÷17+32×6,
=9+192,
=201;
(2)812÷(532-36×14),
=812÷(532-504),
=812÷28,
=29;
(3)83×29+17×29,
=(83+17)×29,
=100×29,
=2900;
(4)99×64,
=(100-1)×64,
=100×64-1×64,
=6400-64,
=6336;
(5)245-148-52,
=245-(148+52),
=245-200,
=45;
(6)350÷42,
=350÷(7×6),
=350÷7÷6,
=50÷6,
=8.
分析:(1)先算除法和乘法,再算加法;
(2)先算乘法,再算减法,最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据连减的性质进行计算;
(6)根据连除的性质进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
=9+192,
=201;
(2)812÷(532-36×14),
=812÷(532-504),
=812÷28,
=29;
(3)83×29+17×29,
=(83+17)×29,
=100×29,
=2900;
(4)99×64,
=(100-1)×64,
=100×64-1×64,
=6400-64,
=6336;
(5)245-148-52,
=245-(148+52),
=245-200,
=45;
(6)350÷42,
=350÷(7×6),
=350÷7÷6,
=50÷6,
=8.
分析:(1)先算除法和乘法,再算加法;
(2)先算乘法,再算减法,最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据连减的性质进行计算;
(6)根据连除的性质进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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