简便计算2.9×1.4+2×0.16 5.4×2.08+67×0.208-2.08125×3.2×6 &nbs...
简便计算2.9×1.4+2×0.165.4×2.08+67×0.208-2.08125×3.2×616.5-3.9+3.5-6.1....
简便计算2.9×1.4+2×0.16 5.4×2.08+67×0.208-2.08125×3.2×6 16.5-3.9+3.5-6.1.
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(1)2.9×1.4+2×0.16
=4.06+0.32
=4.38;
(2)5.4×2.08+67×0.208-2.08
=5.4×2.08+6.7×2.08-2.08×1
=(5.4+6.7-1)×2.08
=11.1×2.08
=11.1×(2+0.08)
=22.2+0.888
=23.088;
(3)125×3.2×6
=125×(8×0.4)×6
=(125×8)×(0.4×6)
=1000×2.4
=2400;
(4)16.5-3.9+3.5-6.1
=(16.5+3.5)-(3.9+6.1)
=20-10
=10.
=4.06+0.32
=4.38;
(2)5.4×2.08+67×0.208-2.08
=5.4×2.08+6.7×2.08-2.08×1
=(5.4+6.7-1)×2.08
=11.1×2.08
=11.1×(2+0.08)
=22.2+0.888
=23.088;
(3)125×3.2×6
=125×(8×0.4)×6
=(125×8)×(0.4×6)
=1000×2.4
=2400;
(4)16.5-3.9+3.5-6.1
=(16.5+3.5)-(3.9+6.1)
=20-10
=10.
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