用递等式计算,能简算的就简算.
(1)(0.1-0.09)×100
(2)3.12÷0.025×1.5
(3)1.2×2.5×4×0.2×5
(4)0.25×0.125×32
(5)1.25+1.25+1.25×8
(6)70.6-35×1.7+13.5÷5.
用递等式计算,能简算的就简算.(1)(0.1-0.09)×100(2)3.12÷0.025×1.5(3)1.2×2.5×4×0.2×5(4)0.25×0.125×32
答案:2 悬赏:60 手机版
解决时间 2021-01-19 11:53
- 提问者网友:你给我的爱
- 2021-01-19 01:51
最佳答案
- 五星知识达人网友:duile
- 2019-11-12 02:47
解:
(1)(0.1-0.09)×100,
=0.1×100-0.09×100,
=10-9,
=1;
(2)3.12÷0.025×1.5,
=124.8×1.5,
=187.2;
(3)1.2×2.5×4×0.2×5,
=1.2×(2.5×4)×(0.2×5),
=1.2×10×1,
=12;
(4)0.25×0.125×32,
=0.25×0.125×(4×8),
=(0.25×4)×(0.125×8),
=1×1,
=1;
(5)1.25+1.25+1.25×8,
=1.25×(1+1+8),
=1.25×10,
=12.5;
(6)70.6-35×1.7+13.5÷5,
=70.6-59.5+2.7,
=11.1+2.7,
=13.8.解析分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算乘法;
(3)根据乘法交换律和结合律进行简算;
(4)根据乘法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)先算乘法和除法,再算减法,最后算加法.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.
(1)(0.1-0.09)×100,
=0.1×100-0.09×100,
=10-9,
=1;
(2)3.12÷0.025×1.5,
=124.8×1.5,
=187.2;
(3)1.2×2.5×4×0.2×5,
=1.2×(2.5×4)×(0.2×5),
=1.2×10×1,
=12;
(4)0.25×0.125×32,
=0.25×0.125×(4×8),
=(0.25×4)×(0.125×8),
=1×1,
=1;
(5)1.25+1.25+1.25×8,
=1.25×(1+1+8),
=1.25×10,
=12.5;
(6)70.6-35×1.7+13.5÷5,
=70.6-59.5+2.7,
=11.1+2.7,
=13.8.解析分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算乘法;
(3)根据乘法交换律和结合律进行简算;
(4)根据乘法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)先算乘法和除法,再算减法,最后算加法.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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- 1楼网友:从此江山别
- 2019-12-04 20:02
我也是这个答案
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