用递等式计算(能简算的简算,并写出简算过程)345-2442÷37+34(4-3.5×23)÷119180÷15+42×33-2398.59-2.07÷0.3×1.1(225-3.5÷258)×(2512+4.25)[6-(49×6.3+2310)]÷0.15.-数学
题文
用递等式计算(能简算的简算,并写出简算过程) 345-2442÷37+34 (4-3.5×
180÷15+42×33-239 8.59-2.07÷0.3×1.1 (2
[6-(
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答案
(1)345-2442÷37+34, =345-66+34, =279+34, =313; (2)(4-3.5×
=(4-
=(4-
=
=1
(3)180÷15+42×33-239, =12+1386-239, =1398-239, =1159; (4)8.59-2.07÷0.3×1.1, =8.59-6.9×1.1, =8.59-7.59, =1; (5)(2
=(2
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