脱式计算(能简算的要简算)17.64÷4.9+6.73 3.4÷[(1.2+0.
脱式计算(能简算的要简算)17.64÷4.9+6.733.4÷[(1.2+0.5)×5]1.9+19.9+199.9+0.30.25×12.5×3.2....
脱式计算(能简算的要简算)17.64÷4.9+6.73 3.4÷[(1.2+0.5)×5] 1.9+19.9+199.9+0.3 0.25×12.5×3.2.
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(1)17.64÷4.9+6.73
=3.6+6.73,
=10.33;
(2)3.4÷[(1.2+0.5)×5]
=3.4÷[1.7×5],
=3.4÷1.7÷5,
=2÷5,
=0.4;
(3)1.9+19.9+199.9+0.3
=1.9+19.9+199.9+0.1+0.1+0.1,
=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),
=2+20+200,
=222;
(4)0.25×12.5×3.2
=0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10.
=3.6+6.73,
=10.33;
(2)3.4÷[(1.2+0.5)×5]
=3.4÷[1.7×5],
=3.4÷1.7÷5,
=2÷5,
=0.4;
(3)1.9+19.9+199.9+0.3
=1.9+19.9+199.9+0.1+0.1+0.1,
=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),
=2+20+200,
=222;
(4)0.25×12.5×3.2
=0.25×12.5×0.8×4,
=(0.25×4)×(12.5×0.8),
=1×10,
=10.
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