脱式计算,能简算的要简算①2.9×1.4+2×1.6②(2.44-1.8)÷0

脱式计算,能简算的要简算①2.9×1.4+2×1.6②(2.44-1.8)÷0.4×20③4.6×9+4.6.

第1个回答  2014-11-14
①2.9×1.4+2×1.6,
=4.06+3.2,
=7.26;

②(2.44-1.8)÷0.4×20,
=0.64÷0.4×20,
=1.6×20,
=32;

③4.6×9+4.6,
=4.6×9+4.6×1,
=(9+1)×4.6,
=10×4.6,
=46.
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