脱式计算. (1)45÷0.75- (2)5.25×8.2+5.25×0.8-5.25 (3)18.45 - (4)+

小学数学题库 2025-08-29 00:26:04
脱式计算。(能简算的要简算)
(1)45÷0.75-(15+7.5×0.6)(2)5.25×8.2+5.25×0.8-5.25
(3)18.45 -(3.8×2.7+5.3)(4)+

(1)45÷0.75-(15+7.5×0.6)
=60-(15+4.5)
=60-19.5
=40.5

(2)5.25×8.2+5.25×0.8-5.25
=43.05+4.2-5.25
=42

(3)18.45-(3.8×2.7+5.3)
=18.45-(10.26+5.3)
=18.45-15.56
=2.89


(4)
=--(-)
=
=