脱式计算 (能简算的要简算). 72.8÷5.6+1.49 58.1-29.7÷3 30.94-5.09-4.91 3.94+34.3×
脱式计算(能简算的要简算).72.8÷5.6+1.4958.1-29.7÷330.94-5.09-4.913.94+34.3×0.25.4×2.3+5.4×7.73.2×...
脱式计算 (能简算的要简算). 72.8÷5.6+1.49 58.1-29.7÷3 30.94-5.09-4.91 3.94+34.3×0.2 5.4×2.3+5.4×7.7 3.2×12.5×0.25.
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(1)72.8÷5.6+1.49,
=13+1.49,
=14.49;
(2)58.1-29.7÷3,
=58.1-9.9,
=48.2;
(3)30.94-5.09-4.91,
=30.94-(5.09+4.91),
=30.94-10,
=20.94;
(4)3.94+34.3×0.2,
=3.94+6.86,
=10.8;
(5)5.4×2.3+5.4×7.7,
=5.4×(2.3+7.7),
=5.4×10,
=54;
(6)3.2×12.5×0.25,
=(0.4×0.25)×(8×12.5),
=0.1×100,
=10.
=13+1.49,
=14.49;
(2)58.1-29.7÷3,
=58.1-9.9,
=48.2;
(3)30.94-5.09-4.91,
=30.94-(5.09+4.91),
=30.94-10,
=20.94;
(4)3.94+34.3×0.2,
=3.94+6.86,
=10.8;
(5)5.4×2.3+5.4×7.7,
=5.4×(2.3+7.7),
=5.4×10,
=54;
(6)3.2×12.5×0.25,
=(0.4×0.25)×(8×12.5),
=0.1×100,
=10.
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