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简介:
(1)25.4×1.25×0.8
=25.4×(1.25×0.8)
=25.4×1
=25.4
(2)3.6×10.1
=3.6×(10+0.1)
=3.6×10+3.6×0.1
=36+0.36
=36.36
(3)5.74×29-5.74×19
=5.74×(29-19)
=5.74×10
=57.4
(4)8×(12.5-0.125)
=8×12.5-8×0.125
=100-1
=99
(5)2.31×1.2×0.5
=2.31×(1.2×0.5)
=2.31×0.6
=1.386
(6)99×4.3
=(100-1)×4.3
=100×4.3-4.3
=430-4.3
=425.7