下面各题怎样算简便就怎样算.0.78×101 3.8+5.6÷7×450×0.18×2 5.4×7.2+2.8×5.4.
(1)0.78×101,
=0.78×(100+1),
=0.78×100+0.78×1,
=78+0.78,
=78.78;
(2)3.8+5.6÷7×4,
=3.8+0.8×4,
=3.8+3.2,
=7;
(3)50×0.18×2,
=50×2×0.18,
=100×0.18,
=18;
(4)5.4×7.2+2.8×5.4,
=5.4×(7.2+2.8),
=5.4×10,
=54.
=0.78×(100+1),
=0.78×100+0.78×1,
=78+0.78,
=78.78;
(2)3.8+5.6÷7×4,
=3.8+0.8×4,
=3.8+3.2,
=7;
(3)50×0.18×2,
=50×2×0.18,
=100×0.18,
=18;
(4)5.4×7.2+2.8×5.4,
=5.4×(7.2+2.8),
=5.4×10,
=54.
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