题目内容
计算,能简算的要简算.
101×87 | 25×33×4 | (124-85)×12÷26 |
74×37-34×37+37×60 | 234-66-34 | 125×25×16. |
分析:(1)先把101分解成100+1,再运用乘法分配律简算;
(2)运用乘法交换律简算;
(3)先算小括号里面的减法,再算括号外的乘法,最后算除法;
(4)运用乘法分配律简算;
(5)根据减法的性质简算;
(6)先把16分解成8×2,再运用乘法结合律简算.
(2)运用乘法交换律简算;
(3)先算小括号里面的减法,再算括号外的乘法,最后算除法;
(4)运用乘法分配律简算;
(5)根据减法的性质简算;
(6)先把16分解成8×2,再运用乘法结合律简算.
解答:解:(1)101×87,
=(100+1)×87,
=100×87+1×87,
=8700+87,
=8787;
(2)25×33×4,
=25×4×33,
=100×33,
=3300;
(3)(124-85)×12÷26,
=39×12÷26,
=468÷26,
=18;
(4)74×37-34×37+37×60,
=(74-34+60)×37,
=100×37,
=3700;
(5)234-66-34,
=234-(66+34),
=234-100,
=134;
(6)125×25×16,
=125×25×(8×2),
=(125×8)×(25×2),
=1000×50,
=50000.
=(100+1)×87,
=100×87+1×87,
=8700+87,
=8787;
(2)25×33×4,
=25×4×33,
=100×33,
=3300;
(3)(124-85)×12÷26,
=39×12÷26,
=468÷26,
=18;
(4)74×37-34×37+37×60,
=(74-34+60)×37,
=100×37,
=3700;
(5)234-66-34,
=234-(66+34),
=234-100,
=134;
(6)125×25×16,
=125×25×(8×2),
=(125×8)×(25×2),
=1000×50,
=50000.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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