题目

计算,能简便的要简便计算. (1) 2.08×75﹣83.07 (2) 1.49×101﹣1.49 (3) 8.4×10.1 (4) 3.47×6.84+3.47×3.16 (5) 77.56÷1.25÷0.8 答案: 2.08×75﹣83.07 =156﹣83.07 =72.93 1.49×101﹣1.49 =1.49×(101﹣1) =1.49×100 =149 8.4×10.1 =8.4×(10+0.1) =8.4×10+8.4×0.1 =84+0.84 =84.84 3.47×6.84+3.47×3.16 =3.47×(6.84+3.16) =3.47×10 =34.7 77.56÷1.25÷0.8 =77.56÷(1.25×0.8) =77.56÷1 =77.56
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