72.8/5.6+14.9 0.25X3.2X12.5 6.25/1.25/0.8 42X10.1—4.2全部简便计算

72.8÷5.6+14.9
= 728÷56+14.9
= 13 + 14.9
= 27.9
0.25×3.2×12.5
= 0.25×(4×0.8)×12.5
= (0.25×4)×(0.8×12.5)
=1×10
=10
6.25÷1.25÷0.8
=6.25÷(1.25×0.8)
=6.25÷1
= 6.25
42×10.1—4.2
=4.2×101—4.2×1
= 4.2×(101-1)
= 4.2×100
= 420

72.8/5.6+14.9
= 7*10.4/(7*0.8) + 14.9
= 13 + 14.9
= 27.9

0.25X3.2X12.5
= 0.8X12.5
= 10

6.25/1.25/0.8
= 5/0.8
= 5*5/4
= 6.25

42X10.1—4.2
= 42X(10+0.1) - 42X0.1
= 42X(10+0.1-0.1)
= 42X10
= 420

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