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
展开全部
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
希望能帮助到你
= 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
希望能帮助到你
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