用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3) 35×(1- 3 7
用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3)35×(1-37)÷512(4)(156×413-26)×81...
用递等式计算,能简算的简算(1)85×54÷18+745(2)3.4÷[(1.25+0.45)×23](3) 35×(1- 3 7 )÷ 5 12 (4) (156× 4 13 -26)× 8 11 (5) 7 8 × 12 13 + 7 8 ÷13 .
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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÷(1.25+0.45)÷23, =3.4÷1.7÷23, =2÷23, =
(3) 35×(1-
=35×
=20 ÷
=48; (4) (156×
=(48-26)×
=22×
=16; (5)
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