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一、口算。
$4 - 1.08 =$
$0.13×70 =$
$18×20 =$
$0.65÷13 =$
$2.85 + 6.15 =$
$500×0.6 =$
$2.3 - 0.48 =$
$10.5×2 =$
$5.5÷0.11 =$
$1.3 + 0.26 =$
$2.08 - 1.64 =$
$4×0.17 =$
$0.36÷0.04 =$
$1.3 + 8.46 =$
$0.21÷7 =$
$5.6÷1.4 =$
$960 - 106 =$
$5.24 + 3.76 =$
$20.5 + 2.05 =$
$630÷21 =$
$0.7 - 0.35 =$
$90 + 57 =$
$3.99÷3 =$
$2 + 3.52 =$
$4 - 1.08 =$
2.92
$0.13×70 =$
9.1
$18×20 =$
360
$0.65÷13 =$
0.05
$2.85 + 6.15 =$
9
$500×0.6 =$
300
$2.3 - 0.48 =$
1.82
$10.5×2 =$
21
$5.5÷0.11 =$
50
$1.3 + 0.26 =$
1.56
$2.08 - 1.64 =$
0.44
$4×0.17 =$
0.68
$0.36÷0.04 =$
9
$1.3 + 8.46 =$
9.76
$0.21÷7 =$
0.03
$5.6÷1.4 =$
4
$960 - 106 =$
854
$5.24 + 3.76 =$
9
$20.5 + 2.05 =$
22.55
$630÷21 =$
30
$0.7 - 0.35 =$
0.35
$90 + 57 =$
147
$3.99÷3 =$
1.33
$2 + 3.52 =$
5.52
答案
一、2.92 9.1 360
0.05 9 300
1.82 21 50
1.56 0.44 0.68
9 9.76 0.03
4 854 9
22.55 30 0.35
147 1.33 5.52
0.05 9 300
1.82 21 50
1.56 0.44 0.68
9 9.76 0.03
4 854 9
22.55 30 0.35
147 1.33 5.52
二、解方程。
$96 - 2x = 59$
$24x - 12 = 6×78$
$0.8x + 1.6 = 5.2$
$8x - 6 = 26$
$2x + 1.8 = 15.6÷3$
$4.3x - 7.99 = 13.51$
$96 - 2x = 59$
$24x - 12 = 6×78$
$0.8x + 1.6 = 5.2$
$8x - 6 = 26$
$2x + 1.8 = 15.6÷3$
$4.3x - 7.99 = 13.51$
答案
方程$96 - 2x = 59$
解：
$96 - 2x = 59$
$-2x = 59 - 96$
$-2x = -37$
$x=\frac{37}{2}=18.5$
方程$24x - 12 = 6×78$
解：
$24x - 12 = 6×78$
$24x - 12 = 468$
$24x = 468 + 12$
$24x = 480$
$x = 480÷24$
$x = 20$
方程$0.8x + 1.6 = 5.2$
解：
$0.8x + 1.6 = 5.2$
$0.8x = 5.2 - 1.6$
$0.8x = 3.6$
$x = 3.6÷0.8$
$x = 4.5$
方程$8x - 6 = 26$
解：
$8x - 6 = 26$
$8x = 26 + 6$
$8x = 32$
$x = 32÷8$
$x = 4$
方程$2x + 1.8 = 15.6÷3$
解：
$2x + 1.8 = 15.6÷3$
$2x + 1.8 = 5.2$
$2x = 5.2 - 1.8$
$2x = 3.4$
$x = 3.4÷2$
$x = 1.7$
方程$4.3x - 7.99 = 13.51$
解：
$4.3x - 7.99 = 13.51$
$4.3x = 13.51 + 7.99$
$4.3x = 21.5$
$x = 21.5÷4.3$
$x = 5$
综上，方程$96 - 2x = 59$的解为$x = 18.5$；方程$24x - 12 = 6×78$的解为$x = 20$；方程$0.8x + 1.6 = 5.2$的解为$x = 4.5$；方程$8x - 6 = 26$的解为$x = 4$；方程$2x + 1.8 = 15.6÷3$的解为$x = 1.7$；方程$4.3x - 7.99 = 13.51$的解为$x = 5$。
解：
$96 - 2x = 59$
$-2x = 59 - 96$
$-2x = -37$
$x=\frac{37}{2}=18.5$
方程$24x - 12 = 6×78$
解：
$24x - 12 = 6×78$
$24x - 12 = 468$
$24x = 468 + 12$
$24x = 480$
$x = 480÷24$
$x = 20$
方程$0.8x + 1.6 = 5.2$
解：
$0.8x + 1.6 = 5.2$
$0.8x = 5.2 - 1.6$
$0.8x = 3.6$
$x = 3.6÷0.8$
$x = 4.5$
方程$8x - 6 = 26$
解：
$8x - 6 = 26$
$8x = 26 + 6$
$8x = 32$
$x = 32÷8$
$x = 4$
方程$2x + 1.8 = 15.6÷3$
解：
$2x + 1.8 = 15.6÷3$
$2x + 1.8 = 5.2$
$2x = 5.2 - 1.8$
$2x = 3.4$
$x = 3.4÷2$
$x = 1.7$
方程$4.3x - 7.99 = 13.51$
解：
$4.3x - 7.99 = 13.51$
$4.3x = 13.51 + 7.99$
$4.3x = 21.5$
$x = 21.5÷4.3$
$x = 5$
综上，方程$96 - 2x = 59$的解为$x = 18.5$；方程$24x - 12 = 6×78$的解为$x = 20$；方程$0.8x + 1.6 = 5.2$的解为$x = 4.5$；方程$8x - 6 = 26$的解为$x = 4$；方程$2x + 1.8 = 15.6÷3$的解为$x = 1.7$；方程$4.3x - 7.99 = 13.51$的解为$x = 5$。
