问题
解答题
递等式计算,能简算的就简算.
(1)1.25×8.08
(2)49.5÷7.5+49.5÷2.5
(3)15.7×1.3+14.3×1.3
(4)(1.8-1.8×0.9)÷(0.38-0.28)
答案
(1)1.25×8.08,
=1.25×(8+0.08),
=1.25×8+1.25×0.08,
=10+0.1,
=10.1;
(2)49.5÷7.5+49.5÷2.5,
=6.6+19.8,
=26.4;
(3)15.7×1.3+14.3×1.3,
=(15.7+14.3)×1.3,
=30×1.3,
=39;
(4)(1.8-1.8×0.9)÷(0.38-0.28),
=1.8×(1-0.9)÷0.1,
=1.8×0.1÷0.1,
=1.8.