(1) $x + 3 = 8$
$x + 3 - 3 = 8 - 3$
(2) $x - 13 = 26$
$x - 13 + 13 = 26 ◯$ ( )
(3) $x ÷ 6 = 6$
$x ÷ 6 × 6 = 6 ◯$ ( )
(4) $2x = 68$
$2x ÷ 2 = 68 ◯$ ( )
(5) $0.6x = 3$
$0.6x ÷ 0.6 = 3 ◯$ ( )
(6) $x ÷ 0.3 = 6.2$
$x ÷ 0.3 × 0.3 = 6.2 ◯$ ( )
(7) $x + 0.2 = 8.3$
$x + 0.2 - 0.2 = ( ) ◯ ( )$
(8) $x - 2.6 = 7.4$
$x - 2.6 + 2.6 = ( ) ◯ ( )$
(9) $3.8x = 7.6$
$3.8x ÷ 3.8 = ( ) ◯ ( )$
$x + 3 - 3 = 8 - 3$
(2) $x - 13 = 26$
$x - 13 + 13 = 26 ◯$ ( )
(3) $x ÷ 6 = 6$
$x ÷ 6 × 6 = 6 ◯$ ( )
(4) $2x = 68$
$2x ÷ 2 = 68 ◯$ ( )
(5) $0.6x = 3$
$0.6x ÷ 0.6 = 3 ◯$ ( )
(6) $x ÷ 0.3 = 6.2$
$x ÷ 0.3 × 0.3 = 6.2 ◯$ ( )
(7) $x + 0.2 = 8.3$
$x + 0.2 - 0.2 = ( ) ◯ ( )$
(8) $x - 2.6 = 7.4$
$x - 2.6 + 2.6 = ( ) ◯ ( )$
(9) $3.8x = 7.6$
$3.8x ÷ 3.8 = ( ) ◯ ( )$
答案:
解析:这些题目主要考查解方程的基本步骤,通过等式的性质,在方程两边同时进行相同的运算以求解未知数。
答案:
(1)
解:$x+3=8$
$x+3-3=8-3$
$x=5$
(2)
解:$x-13=26$
$x-13+13=26+13$(填“$+$”和“$13$”)
$x=39$
(3)
解:$x÷6=6$
$x÷6×6=6×6$(填“$×$”和“$6$”)
$x=36$
(4)
解:$2x=68$
$2x÷2=68÷2$(填“$÷$”和“$2$”)
$x=34$
(5)
解:$0.6x=3$
$0.6x÷0.6=3÷0.6$(填“$÷$”和“$0.6$”)
$x=5$
(6)
解:$x÷0.3=6.2$
$x÷0.3×0.3=6.2×0.3$(填“$×$”和“$0.3$”)
$x=1.86$
(7)
解:$x+0.2=8.3$
$x+0.2-0.2=8.3-0.2$(填“$8.3$”、“$-$”和“$0.2$”)
$x=8.1$
(8)
解:$x-2.6=7.4$
$x-2.6+2.6=7.4+2.6$(填“$7.4$”、“$+$”和“$2.6$”)
$x=10$
(9)
解:$3.8x=7.6$
$3.8x÷3.8=7.6÷3.8$(填“$7.6$”、“$÷$”和“$3.8$”)
$x=2$
答案:
(1)
解:$x+3=8$
$x+3-3=8-3$
$x=5$
(2)
解:$x-13=26$
$x-13+13=26+13$(填“$+$”和“$13$”)
$x=39$
(3)
解:$x÷6=6$
$x÷6×6=6×6$(填“$×$”和“$6$”)
$x=36$
(4)
解:$2x=68$
$2x÷2=68÷2$(填“$÷$”和“$2$”)
$x=34$
(5)
解:$0.6x=3$
$0.6x÷0.6=3÷0.6$(填“$÷$”和“$0.6$”)
$x=5$
(6)
解:$x÷0.3=6.2$
$x÷0.3×0.3=6.2×0.3$(填“$×$”和“$0.3$”)
$x=1.86$
(7)
解:$x+0.2=8.3$
$x+0.2-0.2=8.3-0.2$(填“$8.3$”、“$-$”和“$0.2$”)
$x=8.1$
(8)
解:$x-2.6=7.4$
$x-2.6+2.6=7.4+2.6$(填“$7.4$”、“$+$”和“$2.6$”)
$x=10$
(9)
解:$3.8x=7.6$
$3.8x÷3.8=7.6÷3.8$(填“$7.6$”、“$÷$”和“$3.8$”)
$x=2$
(1) $5x = 7.5$
解:$5x = 7.5$
$x = 7.5 ÷ 5$
$x = 1.5$
(2) $x - 4.1 = 0.9$
解:$x - 4.1 = 0.9$
$x = 0.9 + 4.1$
$x = 5$
(3) $5.6x = 56$
解:$5.6x = 56$
$x = 56 ÷ 5.6$
$x = 10$
(4) $x ÷ 1.6 = 5$
解:$x ÷ 1.6 = 5$
$x = 5 × 1.6$
$x = 8$
(5) $x - 7.86 = 0.86$
解:$x - 7.86 = 0.86$
$x = 0.86 + 7.86$
$x = 8.72$
(6) $2.7x = 8.1$
解:$2.7x = 8.1$
$x = 8.1 ÷ 2.7$
$x = 3$
(7) $x ÷ 0.2 = 4.8$
解:$x ÷ 0.2 = 4.8$
$x = 4.8 × 0.2$
$x = 0.96$
解:$5x = 7.5$
$x = 7.5 ÷ 5$
$x = 1.5$
(2) $x - 4.1 = 0.9$
解:$x - 4.1 = 0.9$
$x = 0.9 + 4.1$
$x = 5$
(3) $5.6x = 56$
解:$5.6x = 56$
$x = 56 ÷ 5.6$
$x = 10$
(4) $x ÷ 1.6 = 5$
解:$x ÷ 1.6 = 5$
$x = 5 × 1.6$
$x = 8$
(5) $x - 7.86 = 0.86$
解:$x - 7.86 = 0.86$
$x = 0.86 + 7.86$
$x = 8.72$
(6) $2.7x = 8.1$
解:$2.7x = 8.1$
$x = 8.1 ÷ 2.7$
$x = 3$
(7) $x ÷ 0.2 = 4.8$
解:$x ÷ 0.2 = 4.8$
$x = 4.8 × 0.2$
$x = 0.96$
答案:
(1)
解:$5x = 7.5$
$x = 7.5 ÷ 5$
$x = 1.5$
(2)
解:$x - 4.1 = 0.9$
$x = 0.9 + 4.1$
$x = 5$
(3)
解:$5.6x = 56$
$x = 56 ÷ 5.6$
$x = 10$
(4)
解:$x ÷ 1.6 = 5$
$x = 5 × 1.6$
$x = 8$
(5)
解:$x - 7.86 = 0.86$
$x = 0.86 + 7.86$
$x = 8.72$
(6)
解:$2.7x = 8.1$
$x = 8.1 ÷ 2.7$
$x = 3$
(7)
解:$x ÷ 0.2 = 4.8$
$x = 4.8 × 0.2$
$x = 0.96$
(1)
解:$5x = 7.5$
$x = 7.5 ÷ 5$
$x = 1.5$
(2)
解:$x - 4.1 = 0.9$
$x = 0.9 + 4.1$
$x = 5$
(3)
解:$5.6x = 56$
$x = 56 ÷ 5.6$
$x = 10$
(4)
解:$x ÷ 1.6 = 5$
$x = 5 × 1.6$
$x = 8$
(5)
解:$x - 7.86 = 0.86$
$x = 0.86 + 7.86$
$x = 8.72$
(6)
解:$2.7x = 8.1$
$x = 8.1 ÷ 2.7$
$x = 3$
(7)
解:$x ÷ 0.2 = 4.8$
$x = 4.8 × 0.2$
$x = 0.96$
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