题目

计算. (1) 5400﹣2940÷28×27 (2) (20.2×0.4+7.88)÷4.2 (3) ( )÷ + (4) 10÷[ ﹣( ÷ + )]. 答案: 5400﹣2940÷28×27 =5400﹣105×27 =5400﹣2835 =2565 (20.2×0.4+7.88)÷4.2 =(8.08+7.88)÷4.2 =15.96÷4.2, =3.8 ( 45+14 )÷ 73 + 710 = 2120 ÷ 73 + 710 = 920 + 710 =1 320 10÷[ 83 ﹣( 513 ÷ 526 + 25 )] =10÷[ 83 ﹣(2+ 25 )] =10÷[ 83 ﹣ 125 ] =10÷ 415 =37 12
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