用递等式计算,能简算的简算: 85×54÷18+745 3.4÷[(1.25+0.45)×23] 35×(1- 3 7
用递等式计算,能简算的简算:85×54÷18+7453.4÷[(1.25+0.45)×23]35×(1-37)÷512(156×413-26)×81178×1213+78...
用递等式计算,能简算的简算: 85×54÷18+745 3.4÷[(1.25+0.45)×23] 35×(1- 3 7 )÷ 5 12 (156× 4 13 -26)× 8 11 7 8 × 12 13 + 7 8 ÷13 85.87-(5.87+2.9)
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(1)85×54÷18+745, =85×(54÷18)+745, =85×3+745, =255+745, =1000; (2)3.4÷[(1.25+0.45)×23], =3.4÷[1.7×23], =3.4÷1.7÷23, =2÷23, =
(3)35×(1-
=35×
=35×
=48; (4)(156×
=(48-26)×
=22×
=16; (5)
=
=(
=
(6)85.87-(5.87+2.9), =85.87-5.87-2.9, =(85.87-5.87)-2.9, =80-2.9, =77.1. |
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