Question

五年级解方程数学题

3.5x[6.8—(1.6+( )÷0.9]=4.2,则( )=?

Answer 1

设括号＝y
3.5x[6.8—(1.6+y÷0.9）]=4.2
3.5x[6.8—1.6－y÷0.9]＝4.2
3.5x[5.2－y÷0.9]＝4.2
18.2－35y÷9＝4.2
35y÷9＝14
35y＝126
y＝3.6

Answer 2

解：设括号为x
3.5×[6.8—(1.6+x÷0.9]=4.2
3.5×[6.8—1.6－x÷0.9]＝4.2
3.5×[5.2－x÷0.9]＝4.2
18.2－35x÷0.9＝4.2
35x÷0.9＝16
35x＝14.4
x＝72/175

Answer 3

(6.8-4.2/3.5-1.6)*0.9=(6.8-1.2-1.6)*0.9=4*0.9=3.6

Answer 4

3.44

Answer 5

3.6

Answer 6

3.6