题目内容
计算,怎样简便就怎样计算. 125×103-125×3 |
2700-425-175 |
125×88 | 135×99 |
41+127+59+173 | 1300÷25÷4 |
156×l0l-156 | 568-235+65. |
分析:(1)(4)(7)根据乘法分配律进行计算;
(2)根据连减的简算方法计算;
(3)先变形为125×8×11,再计算;
(5)根据加法交换律及结合律计算;
(6)根据连除的简算方法计算;
(8)从左往右依次计算即可求解.
(2)根据连减的简算方法计算;
(3)先变形为125×8×11,再计算;
(5)根据加法交换律及结合律计算;
(6)根据连除的简算方法计算;
(8)从左往右依次计算即可求解.
解答:解:(1)125×103-125×3
=125×(103-3)
=125×100
=12500;
(2)2700-425-175
=2700-(425+175)
=2700-600
=2100;
(3)125×88
=125×8×11
=1000×11
=11000;
(4)135×99
=135×(100-1)
=135×100-135
=13500-135
=13365;
(5)41+127+59+173
=(41+59)+(173+127)
=100+300
=400;
(6)1300÷25÷4
=1300÷(25×4)
=1300÷100
=13;
(7)156×l0l-156
=156×(l0l-1)
=156×100
=15600;
(8)568-235+65
=333+65
=398.
=125×(103-3)
=125×100
=12500;
(2)2700-425-175
=2700-(425+175)
=2700-600
=2100;
(3)125×88
=125×8×11
=1000×11
=11000;
(4)135×99
=135×(100-1)
=135×100-135
=13500-135
=13365;
(5)41+127+59+173
=(41+59)+(173+127)
=100+300
=400;
(6)1300÷25÷4
=1300÷(25×4)
=1300÷100
=13;
(7)156×l0l-156
=156×(l0l-1)
=156×100
=15600;
(8)568-235+65
=333+65
=398.
点评:考查了运算定律与简便运算,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律简便计算.
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