来自樊锡德的问题
【递等式计算(能巧算就巧算)6.5×10.1;6.72÷1.4+6.72÷1.6;2.71×7.4+27.1×0.36-2.71;2.5×(5.07-1.87)×12.5.】
递等式计算(能巧算就巧算)
6.5×10.1;
6.72÷1.4+6.72÷1.6;
2.71×7.4+27.1×0.36-2.71;
2.5×(5.07-1.87)×12.5.


【递等式计算(能巧算就巧算)6.5×10.1;6.72÷1.4+6.72÷1.6;2.71×7.4+27.1×0.36-2.71;2.5×(5.07-1.87)×12.5.】
递等式计算(能巧算就巧算)
6.5×10.1;
6.72÷1.4+6.72÷1.6;
2.71×7.4+27.1×0.36-2.71;
2.5×(5.07-1.87)×12.5.
(1)6.5×10.1
=6.5×(10+0.1)
=6.5×10+6.5×0.1
=65+0.65
=65.65;
(2)6.72÷1.4+6.72÷1.6
=4.8+4.2
=9;
(3)2.71×7.4+27.1×0.36-2.71
=2.71×7.4+2.71×3.6-2.71
=2.71×(7.4+3.6-1)
=2.71×10
=27.1;
(4)2.5×(5.07-1.87)×12.5
=2.5×3.2×12.5
=(2.5×4)×(0.8×12.5)
=10×10
=100.