题目

递等式计算(能简算的要简算)。 ①7.8×(4.7-3.627÷0.9) ②3.76÷0.4÷0.25 ③7.9+21.21÷2.1 ④2×(0.5+0.125)×8 ⑤3.7×101 ⑥3÷7.5+3÷2.5 答案:①7.8×(4.7-3.627÷0.9) =7.8×(4.7-4.03) =7.8×0.67 =5.226 ②3.76÷0.4÷0.25 =3.76÷(0.4×0.25) =3.76÷0.1 =37.6 ③7.9+21.21÷2.1 =7.9+10.1 =18 ④2×(0.5+0.125)×8 =2×0.5×8+0.125×8×2 =1×8+1×2 =8+2 =10 ⑤3.7×101 =3.7×(100+1) =3.7×100+3.7×1 =370+3.7 =373.7 ⑥3÷7.5+3÷2.5 =0.4+1.2 =1.6
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