登录
1. 直接写出得数。(20☆)
$1.25×0.4 = $
$9.2÷0.2 = $
$3.8×6 = $
$12.8 - 6.7 = $
$19×0.4 = $
$43.2÷10 = $
$1.4÷0.7 = $
$7.2÷9 = $
$2.8 + 8.3 = $
$8.8 + 8.8 = $
$0.48÷0.06 = $
$4.1 + 9.6 = $
$9.2 - 4.3 = $
$9.8×2 = $
$3.8×0.2 = $
$5.78×1000 = $
$7.2÷12 = $
$7.6 - 1.7 = $
$5.5×2 = $
$4.4÷0.44 = $
$55×0.7 = $
$0.125×8 = $
$8.8 + 2.9 = $
$7÷8 = $
$3.3×0.3 = $
$5÷4 = $
$7.3 + 8.6 = $
$3.2×100 = $
$2.4×0.5 = $
$2.5×20 = $
$45÷1.5 = $
$26.5÷5 = $
$21t - 16t = $
$5a + 2a = $
$1.5y + 2.5y = $
$12s - 8s = $
$3y + 6y = $
$11x - 11x = $
$3.7x - 2.3x = $
$(x - 3)×2 = $
$1.25×0.4 = $
0.5
$9.2÷0.2 = $
46
$3.8×6 = $
22.8
$12.8 - 6.7 = $
6.1
$19×0.4 = $
7.6
$43.2÷10 = $
4.32
$1.4÷0.7 = $
2
$7.2÷9 = $
0.8
$2.8 + 8.3 = $
11.1
$8.8 + 8.8 = $
17.6
$0.48÷0.06 = $
8
$4.1 + 9.6 = $
13.7
$9.2 - 4.3 = $
4.9
$9.8×2 = $
19.6
$3.8×0.2 = $
0.76
$5.78×1000 = $
5780
$7.2÷12 = $
0.6
$7.6 - 1.7 = $
5.9
$5.5×2 = $
11
$4.4÷0.44 = $
10
$55×0.7 = $
38.5
$0.125×8 = $
1
$8.8 + 2.9 = $
11.7
$7÷8 = $
0.875
$3.3×0.3 = $
0.99
$5÷4 = $
1.25
$7.3 + 8.6 = $
15.9
$3.2×100 = $
320
$2.4×0.5 = $
1.2
$2.5×20 = $
50
$45÷1.5 = $
30
$26.5÷5 = $
5.3
$21t - 16t = $
5t
$5a + 2a = $
7a
$1.5y + 2.5y = $
4y
$12s - 8s = $
4s
$3y + 6y = $
9y
$11x - 11x = $
0
$3.7x - 2.3x = $
1.4x
$(x - 3)×2 = $
2x - 6
答案
0.5 46 22.8 6.1 7.6 4.32 2 0.8 11.1 17.6 8 13.7 4.9 19.6 0.76 5780 0.6 5.9 11 10 38.5 1 11.7 0.875 0.99 1.25 15.9 320 1.2 50 30 5.3 5t 7a 4y 4s 9y 0 1.4x 2x - 6
2. 解方程,带*的要检验。(21☆)
$3x - 9.6 = 3.9$
$7(x + 5) = 49$
$5(x + 7) = 135$
$(2 + 3x)÷4 = 5$
$(3.3x - 1.2x)×3 = 3.15$
*$2.5(100 - 2x) = 10$
$3x - 9.6 = 3.9$
x = 4.5
$7(x + 5) = 49$
x = 2
$5(x + 7) = 135$
x = 20
$(2 + 3x)÷4 = 5$
x = 6
$(3.3x - 1.2x)×3 = 3.15$
x = 0.5
*$2.5(100 - 2x) = 10$
x = 48
答案
x = 4.5 x = 2 x = 20 x = 6 x = 0.5 x = 48
3. 小马虎在计算一道混合运算题$(△ + 23)×30 - 21$时,错抄成$(△÷23)×30 - 21$,这样的计算结果是 69,则这道混合运算题的正确答案是多少？(9☆)
用时：____分钟
★共得：
用时：____分钟
★共得：
2739
☆/50☆答案
$(\triangle ÷ 23)× 30 - 21 = 69$，解得$\triangle = 69$。代入原式求得$(\triangle + 23)× 30 - 21 = 2739$。
