计算下面各题,能简算的用简便方法算.(1)0.8×3.9×1.25 &n...
计算下面各题,能简算的用简便方法算.(1)0.8×3.9×1.25(2)3.6×10.1(3)4.8×1.25(4)4.87×2.34+48.7×0.266....
计算下面各题,能简算的用简便方法算.(1)0.8×3.9×1.25 (2)3.6×10.1(3)4.8×1.25 (4)4.87×2.34+48.7×0.266.
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(1)0.8×3.9×1.25
=0.8×1.25×3.9
=1×3.9
=3.9;
(2)3.6×10.1
=3.6×(10+0.1)
=3.6×10+3.6×0.1
=36+0.36
=36.36;
(3)4.8×1.25
=6×0.8×1.25
=6×(0.8×1.25)
=6×1
=6;
(4)4.87×2.34+48.7×0.266
=4.87×2.34+4.87×2.66
=4.87×(2.34+2.66)
=4.87×5
=24.35.
=0.8×1.25×3.9
=1×3.9
=3.9;
(2)3.6×10.1
=3.6×(10+0.1)
=3.6×10+3.6×0.1
=36+0.36
=36.36;
(3)4.8×1.25
=6×0.8×1.25
=6×(0.8×1.25)
=6×1
=6;
(4)4.87×2.34+48.7×0.266
=4.87×2.34+4.87×2.66
=4.87×(2.34+2.66)
=4.87×5
=24.35.
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