0.5+7.4+5.9
计算下面各题,能简算的要用简便方法算4.78+0.22×20÷16 ...
计算下面各题,能简算的要用简便方法算 4.78+0.22×20÷16 31.7-0.5×0.7-1.65 10-7.5×(6.4-5.9) 5.7×8.06+1.94×5.7 [2.95+(10.58-3.53)]÷0.25 3.5×4-96.24÷24+4.01
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(1)4.78+0.22×20÷16
=4.78+4.4÷16
=4.78+0.275
=5.055;
(2)31.7-0.5×0.7-1.65
=31.7-0.35-1.65
=31.7-(0.35+1.65)
=31.7-2
=29.7;
(3)10-7.5×(6.4-5.9)
=10-7.5×0.5
=10-3.75
=6.25;
(4)5.7×8.06+1.94×5.7
=5.7×(8.06+1.94)
=5.7×10
=57;
(5)[2.95+(10.58-3.53)]÷0.25
=[2.95+7.05]÷0.25
=10÷0.25
=40;
(6)3.5×4-96.24÷24+4.01
=14-4.01+4.01
=9.99+4.01
=14.
=4.78+4.4÷16
=4.78+0.275
=5.055;
(2)31.7-0.5×0.7-1.65
=31.7-0.35-1.65
=31.7-(0.35+1.65)
=31.7-2
=29.7;
(3)10-7.5×(6.4-5.9)
=10-7.5×0.5
=10-3.75
=6.25;
(4)5.7×8.06+1.94×5.7
=5.7×(8.06+1.94)
=5.7×10
=57;
(5)[2.95+(10.58-3.53)]÷0.25
=[2.95+7.05]÷0.25
=10÷0.25
=40;
(6)3.5×4-96.24÷24+4.01
=14-4.01+4.01
=9.99+4.01
=14.
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