...4.28+4.72×2.5 3.14×5.5+0.314×45 19.72×10
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发布时间:2024-09-28 05:53
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时间:2024-10-08 11:18
(1)0.25×5×1.6
=0.25×5×4×0.4
=(0.25×4)×(5×0.4)
=1×2
=2;
(2)4.28+4.72×2.5
=4.28+1.18×4×2.5
=4.28+1.18×(4×2.5)
=4.28+1.18×10
=4.28+11.8
=16.08;
(3)3.14×5.5+0.314×45
=3.14×5.5+3.14×4.5
=3.14×(5.5+4.5)
=3.14×10
=31.4;
(4)19.72×101-19.72
=19.72×(101-1)
=19.72×100
=1972;
(5)3.7×4.85+16.07
=17.945+16.07
=34.015;
(6)(0.718+0.718+0.718+0.718)×0.25
=(0.718×4)×0.25
=0.718×(4×0.25)
=0.718×1
=0.718.