问题
解答题
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.
答案
(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.