小学六年级上册数学解方程训练

小学六年级上册数学解方程训练小学六年级上册数学解方程训练 解方程的依据解方程的依据：加减乘除法的变形 (1) 加法：a + b = 和则a = 和－bb = 和－a 例：4+5=9 则有：4=9-55=9-4 (2) 减法：被减数 a –减数 b = 差则： 被减数 a= 差＋减数 b被减数 a－差 = 减数 b 例：12-4=8则有：12=8+412-8=4 (3) 乘法：乘数 a × 乘数 b = 积则： 乘数 a = 积 ÷ 乘数 b乘数 b= 积 ÷ 乘数 a 例：3×7=21则有：3=21÷77=21÷3 (4) 除法：被除数 a ÷ 除数 b = 商则： 被除数 a= 商 × 除数 b除数 b=被除数 a ÷ 商 例：63÷7=9则有：63=9×77=63÷9 ６×６× X-2/7X=3/4 70%X + 20%X = 3.6 25% + 10X =4/5 X-2/7X=3/4 70%X + 20%X = 3.6 25% + 10X =4/5 1 －－ 1 χ＝χ＝ 1 χ－χ－ 3 χ＝χ＝ 6 551222 3 χ＋χ＋ 1 ＝＝ 1 442 χ－χ－ 4 χ＝χ＝1212 7 χχ= = 11 χ×χ×（（ 3 + + 2 ））= = 581643 7 24 X - 15%X = 68 X+3/8 X=121 5X-3X - 15%X = 68 X+3/8 X=121 5X-3××5/21 =5/15/21 =5/1 1 1 5X5X－－3 3×× （（x x－－6 6）×）× 5 ＝＝25 6X25 6X＋＋5 =13.4 3X=5 =13.4 3X= 3 68 77 = = 4 ＋＋ 1 X=X= 9 8x 8x－－ 1 ××3 3＝＝ 45 410552104 6X+5 =13.4 X6X+5 =13.4 X÷÷(6/35) =(26/45)(6/35) =(26/45) ××(13/25) 2(x-0.6)=4(13/25) 2(x-0.6)=4 (0.5+x)+x=9.8(0.5+x)+x=9.8÷÷2 22(X+X+0.5)=9.8 25000+x=6x2(X+X+0.5)=9.8 25000+x=6x 2 22 23 3 3 X X－－ X= X= 2X + 2X + = = X X×× 3 =20=20×× 1 7 75 55 5 544 3200=450+5X+X3200=450+5X+X X-0.8X=6 X-0.8X=612x-8x=4.812x-8x=4.8 X X＋＋ 3 8 X X＝＝121 5X121 5X 7.5*2X=157.5*2X=15 X X÷÷ 27 7 = = 16 X X 52-x =1552-x =15 －－3 3×× 5 21 ＝＝ 5 7 1.2x=81.61.2x=81.6 ＋＋ 7 8 X=X= 3 4 4X 4X 9191÷÷x =1.3x =1.3 2 3 X X÷÷ 1 4 ＝＝1212 x+5.6=9.4x+5.6=9.4 －－6 6×× 2 3 =2=2 X+8.3=10.7X+8.3=10.7 12123 3 ÷÷X=X= 3 X = X = 258 X = X = 1 ××16 5 51010 5729651 15x =315x =33x-8=163x-8=167(x-2)=2x+37(x-2)=2x+3 X X÷÷ 3x+9=2718(x-2)=2703x+9=2718(x-2)=27012x=300-4x12x=300-4x7x+5.3=7.47x+5.3=7.4 3x3x÷÷5=4.8 305=4.8 30÷÷x+25=85x+25=851.41.4××8-2x=68-2x=6 626 = =×× 13 4 4x x－－3 3 ××9 = 299 = 29 1 x x + + 1 25354526 x x = 4 = 4 3 31 13 31313 32 X X－－2121×× =4 X+=4 X+ X=18 X X=18 X××( ( + + )= )= 7 76 68 81212 103 6x-12.86x-12.8××3=0.063=0.06410-3x=170410-3x=170 3(x+0.5)=21 3(x+0.5)=21 0.5x+8=430.5x+8=43 6x-3x=18 6x-3x=18(200-x)(200-x)÷÷5=305=30 (x-140)(x-140)÷÷70=470=4 7(6.5+x)=87.5 (27.5-3.5)7(6.5+x)=87.5 (27.5-3.5) 6.6-5X=3/4-4X6.6-5X=3/4-4X 2(X+X+0.5)=9.82(X+X+0.5)=9.8 X-0.8X=6X-0.8X=6 1.2x=81.61.2x=81.6 91÷91÷x x ＝＝1.31.3 ××0.40.44(x-5.6)=1.64(x-5.6)=1.6 ÷÷x=4x=43X-(1/2+1/4)=7/123X-(1/2+1/4)=7/12 1.1X+2.2=5.5-3.3X1.1X+2.2=5.5-3.3X(0.5+x)+x=9.8÷(0.5+x)+x=9.8÷2 2 25000+x=6x25000+x=6x3200=450+5X+X3200=450+5X+X 7.5*2X=157.5*2X=15 x+5.6=9.4x+5.6=9.45252－－x x ＝＝1515 30 x12x30 x12x－－14x=114x=1x-0.7x=3.6x-0.7x=3.6 0.1(x+6)=3.3 0.1(x+6)=3.3 12x-8x=4.812x-8x=4.8 2 21 13 3 6X6X＋＋5 =13.45 =13.4 X- X- X= X= 4 4χ－χ－6 6＝＝3838 X-5.7=2.15X-5.7=2.15 3.5×3.5×2= 4.2 x2= 4.2 x 9.259.25－－X=0.403X=0.403 3 3－－5x5x＝＝8080 9 9 ＋＋4x4x＝＝4040 1212－－4x4x＝＝2020 5 53 31010 15 5X-2X=1815 5X-2X=18 26×26×1.5= 2x1.5= 2x 16.9÷16.9÷X=0.3X=0.3 1.8-6x1.8-6x＝＝5454 0.2x0.2x－－0.40.4＋＋0.50.5＝＝3.73.7 1/3x1/3x＋＋5/6x5/6x＝＝1.41.4 3X 0.7=53X 0.7=5 0.5×16―16×0.2=4x0.5×16―16×0.2=4x X÷X÷0.5=2.60.5=2.6 6.7x6.7x－－60.360.3＝＝6.76.7 9.4x9.4x－－0.4x0.4x＝＝16.216.2 12x12x＋＋34x=134x=1 18x18x－－14x=1214x