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简介:
(1)4.63×1.4+46.3×0.86
=46.3×0.14+46.3×0.86
=46.3×(0.14+0.86)
=46.3×1
=46.3
(2)125×3.2×2.5
=125×8×0.4×2.5
=(125×8)×(0.4×2.5)
=1000×1
=1000
(3)0.9+9.9+99.9+999.9
=1﹣0.1+10﹣0.1+100﹣0.1+1000﹣0.1
=(1+10+100+1000)﹣(0.1+0.1+0.1+0.1)
=1111﹣0.4
=1110.6
(4)25×11.2×4
=25×4×11.2
=100×11.2
=1120
(5)23.25﹣6.75﹣3.25
=23.25﹣(6.75+3.25)
=23.25﹣10
=13.25