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4. 算一算。
$8.3 - 3.2 =$
$9.7 + 4.05 =$
$15.4 - 2.1 =$
$11.5 + 0.13 =$
$1 - 0.03 =$
$8.2 + 1.8 =$
$6.33 ÷ 10 =$
$4.18 × 10 =$
$0.7 × 0.08 =$
$7.9 × 100 =$
$3.6 × 0.3 =$
$0.04 × 0.02 =$
$8.3 - 3.2 =$
$9.7 + 4.05 =$
$15.4 - 2.1 =$
$11.5 + 0.13 =$
$1 - 0.03 =$
$8.2 + 1.8 =$
$6.33 ÷ 10 =$
$4.18 × 10 =$
$0.7 × 0.08 =$
$7.9 × 100 =$
$3.6 × 0.3 =$
$0.04 × 0.02 =$
答案
5.1 13.75 13.3 11.63 0.97 10 0.633 41.8 0.056 790 1.08 0.0008
5. 用竖式计算。
$17.52 + 5.09 =$
$30 - 3.61 =$
$3.05 × 0.84 =$
$870 × 0.92 =$
$17.52 + 5.09 =$
$30 - 3.61 =$
$3.05 × 0.84 =$
$870 × 0.92 =$
答案
(竖式略)22.61 26.39 2.562 800.4
6. 解方程。
$3x + 5.4 = 15.6$
$6x - 26 = 34$
$9x - 4x = 105$
$3x + 5.4 = 15.6$
$6x - 26 = 34$
$9x - 4x = 105$
答案
$x=3.4$ $x=10$ $x=21$
7. 用简便算法计算。
$5.2 - 0.26 - 0.74$
$7.3 × 3.8 + 7.3 × 6.2$
$15.39 + 22.67 + 4.61 + 7.33$
$1.27 × 0.59 - 0.27 × 0.59$
$5.2 - 0.26 - 0.74$
$7.3 × 3.8 + 7.3 × 6.2$
$15.39 + 22.67 + 4.61 + 7.33$
$1.27 × 0.59 - 0.27 × 0.59$
答案
4.2 73 50 0.59
