看谁算得巧妙. 1.29+3.7+0.71+6.3 8.65÷5×1.3 8.4÷(0.5+1.6) 0.25×4.5×4×6 0.85×
看谁算得巧妙.1.29+3.7+0.71+6.38.65÷5×1.38.4÷(0.5+1.6)0.25×4.5×4×60.85×25-17×0.85(7.9-2.4-3....
看谁算得巧妙. 1.29+3.7+0.71+6.3 8.65÷5×1.3 8.4÷(0.5+1.6) 0.25×4.5×4×6 0.85×25-17×0.85 (7.9-2.4-3.6)×2.5.
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(1)1.29+3.7+0.71+6.3,
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)8.65÷5×1.3,
=1.73×1.3,
=2.249;
(3)8.4÷(0.5+1.6),
=8.4÷2.1,
=4;
(4)0.25×4.5×4×6,
=(0.25×4)×(4.5×6),
=1×27,
=27;
(5)0.85×25-17×0.85,
=0.85×(25-17),
=0.85×8,
=6.8;
(6)(7.9-2.4-3.6)×2.5,
=[7.9-(2.4+3.6)]×2.5,
=[7.9-6]×2.5,
=1.9×2.5,
=4.75.
=(1.29+0.71)+(3.7+6.3),
=2+10,
=12;
(2)8.65÷5×1.3,
=1.73×1.3,
=2.249;
(3)8.4÷(0.5+1.6),
=8.4÷2.1,
=4;
(4)0.25×4.5×4×6,
=(0.25×4)×(4.5×6),
=1×27,
=27;
(5)0.85×25-17×0.85,
=0.85×(25-17),
=0.85×8,
=6.8;
(6)(7.9-2.4-3.6)×2.5,
=[7.9-(2.4+3.6)]×2.5,
=[7.9-6]×2.5,
=1.9×2.5,
=4.75.
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