4.7×10.20.88×4.9+5.1×0.882.5×8×0.4×0.12530.5-15.64-12.36×0.4.
计算题
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(1)4.7×10.2,
=4.7×(10+0.2),
=4.7×10+4.7×0.2,
=47+0.94,
=47.94;(2)0.88×4.9+5.1×0.88,
=0.88×(4.9+5.1),
=0.88×10,
=8.8;(3)2.5×8×0.4×0.125,
=(2.5×0.4)×(0.125×8),
=1×1,
=1;(4)30.5-15.64-12.36×0.4,
=30.5-15.64-4.944,
=30.5-(15.64+4.944),
=30.5-20.584,
=9.916.
