脱式计算. (1)5.4×5.08+3.6×5.08+5.08 (2)0.25×588.5×400 -1.9]÷0.125 × 0.8-1] ×0.4 (5) (6)

小学数学题库 2025-08-29 00:25:42
脱式计算。
(1)5.4×5.08+3.6×5.08+5.08(2)0.25×588.5×400
(3)[9-(4.68+ 1.42)-1.9]÷0.125 (4)[(6.1 - 4.6)× 0.8-1] ×0.4
(5)(6)

(1)5.4×5.08+3.6×5.08+5.08
=(5.4+3.6+1)×5.08
=10×5.08
=50.8

(2)0.25×588.5×400
=0.25×400×588.5
=100×588.5
=58850
(3)[9-(4.68+ 1.42)-1.9]÷0.125
=[9-6.1-1.9]÷0.125
=1÷0.125
=8

(4)[(6.1 - 4.6)× 0.8-1] ×0.4
=[1.5×0.8-1]×0.4
=[1.2-1]×0.4
=0.08

(5)
=4.125+0+4.125
=8.25

(6)
=3+4.58+2.42
=3+7
=10