问题
解答题
脱式计算.(能简算的要简算)
6.8×0.26+3.75
(9-2.35)×0.48
4×O.8×2.5×1.25
2.75×102.
答案
(1)6.8×0.26+3.75
=1.768+3.75,
=5.518;
(2)(9-2.35)×0.48,
=6.65×0.48,
=3.192;
(3)4×O.8×2.5×1.25,
=(4×2.5)×(O.8×1.25),
=10×1,
=10;
(4)2.75×102,
=2.75×(100+2),
=2.75×100+2.75×2,
=275+5.5,
=280.5.