Toán 6 - Ôn tập chương II: Số nguyên

Bài 1: Tìm x, biết: x+120=50 x-30=-20 x+(-60)=110 103-x=-31 –x-34=29 -25+x=-315 45+(-x)=-68 210-x=272 -100:x=25 150-x=250 10-x=172 -20.x=200 x:9=-26 –x:(-15)=23 -21.x=-672 300:(-x)=60 -41.x=943 –x:24=145 –x.(-16)=368 x:(-48)=54 15.(-x)=345 Bài 2: Tìm x, biết: Bài 3: Tìm x, biết: x+30+15=5 -x+29-29=40 71-33+x=26 x+73-26=-76 -89-73-x=20 x+7-25=-169 198-x+4=230 21-19+x=-12 43-x+160-105 45-x+9=-38 15-(9-x)=135 -125-(-x+9)=38 127+(10-x)=35 28-(-x+4)=130 (-x-15)+86=15 48-(9-x)=150 -73-(-15-x)=26 (45-x)-30=-100 790-(x-15)=430 680-(25-x)=-132 Bài 4: Tìm x, biết: 18-2(x-5)=-38 27-3(x-5)=-24 4.(x+2)-12=212 2.(x-350)-106=24 5.(x+2)-26=144 2.(x-15)-106=240 3.(x-21)+420=-540 5.(-21+x)-150=-315 (x-5).6-210=-282 (25-x).8-210=-306 123-(x+9(.5=253 119-(x-13).5=369 130-(x+56).5=215 5.(x-53)-115=65 498-(x+10).12=66 3.(x-21)-420=540 5.(x-37)+109=54 16.(x+21)-127=289 6.x-25+14=-190 -2.(x-45)+23=3 Bài 5: Tìm x, biết: –41+3x.10=-50 14+3x+14.4=10 3.(2x-10)-16=-16 3.(25-6x)+13=196 -45:.5(-3-2x)=9 540-14.(x+15)=-132 3.(2x-10)+163=331 1990-2x+36.5=90 -75:5.(-3-2x)=45 100-2.(4-3x)=-4 (5x+65):10=-24 25+5x+16.2=27 23-6x-12.3=131 8x+36:2=27 4x-14.3+14=-64 -160:-30+9-3x.3=59 Bài 6: Tìm x, biết: 15+2.[10-(18-4x)]=31 134+[28-(126+x)]=65 [(15-x).3+128]-36=152 148+2.[7+3.(25-x)]=288 180-2.[7+3.(x-5)]=148 126-[28-(x-126)]=7 -180-2[7+3.(29-x)]=148 15.[4+3.(3+x)]-325=680 –[-15-3.(-9+x)-17]=8 15-[-6-(x-36)+9]=-1 [(2x+51)-97].3=8.9 -136+3.[2.(x+9)-45]=-127 Bài 7: Tìm x, biết: 2.(x-5)-3.(x-7)=15 x-3.(x-15)=-27 12-x.(x-7)=31-3.(x+12) x-(-18-2x)=-33 2.(x-10)-3.(x+11)=-12 3.(x+24)-56=2.(x+76) 18-3.(x+7)=38+2.(x-12) 2.(x-3)-4.(x-5)=-20 37-(26-x)-(37+x)=-28 36-(27-x)=63-x x-2.(x-35)=72 x-3.(13+x)=-113 15+(x-9)=28-x 25-(x-27)=-18-(x-9) 2-(20-x)=36 2-3.(x-7)=15-(x-9) 5.(x-23)+4.(x+24)=-307 133-2.(x+32)=(x+24)-54 Bài 8: Tìm x, biết: (x-5)⋮(x-2) (x+4)⋮(x+1) (3x+9)⋮(x+2) (4x+3)⋮(x+2) (x-7)⋮(x+2) (x+3)⋮((x-15) (2x-7)⋮(x-8) (3x-5)⋮(x+3) (6x-1)⋮(3x+2) (x-3)⋮(2x-10) (5x-7)⋮(19+x) (4x-5)⋮(8+x) (3x-5)⋮(4-x) (4x+3)⋮(3-2x) (6-2x)⋮(13-x) Bài 9: Tìm x,y biết: ( x - 6 ).( y + 7 ) = 2 ( x + 3 ).( y – 5 ) = 3 ( 2x + 1 ).( y + 4 ) = 4 ( 6 - 2x ).( 3y – 1 ) = 5 ( 3x - 7 ).( 4y + 2 ) = 6 ( 9 -2x ).( 3y + 1 ) = 7 ( 4 + 3x ).( 2y - 1 ) = 8 ( 14 - 4x ).( 3y + 2 )= 9 ( 2 - 3x ).( 3y – 1 ) = 24 ( 6x - 3 ).( 3y +2 ) =12 ( 19 – x ).( y – 8 ) = 17 ( x - 6 ).( 2y + 7 ) = 15 ( 50 + x ).( 3 - 2y ) = 19 ( 21 + 2x ).( 3y- 8 ) = 10 ( 2x – 7 ).( 4y – 3 ) = 11 Bài 10: Tìm x trong biểu thức chứa dấu giá trị tuyệt đối: x-5=0 2x-7=5 3x-6=9 12-x=28 21-2x=19 x-5+36-42=0 x-3+3=9 x-5+5=3 x-21+56-78=14 4.x-17=28 5+19-x=-29 6:x+8=2 156:x-9=39 186:364-2x=93 25.2x-7=125 48.3x+9=288 94:2x-52=47 6.4x+24=24 5.5x+15=125 5.10-x=50 7.7x+49=343 8.8x+64=512 9.9x+81=729 295-2.x-14=169 491-3.x+17=122 564-4.x-16=452 980-5.2x+80=220 493-6.2x-14=325 90+7.x-17=293 372+8.2x+19=60 40+9.3x+9=202 356:x-9=25+(-9) 109:2x+3=109-2017+1 486:3x-9=83-2 248-5x+20=-2+95 12-x=19+21-219 2.x-3+41=39 3.6x-7-5=2 21-2.x-3=19 10x-34+39=28 Bài 11: Tìm x trong biểu thức lũy thừa: x2=4 x2=9 (x-2)2=16 (x+3)2=25 (2x+8)2=36 (x-14)2=49 x2=64 x2=81 x2=100 x2=121 x2=144 x3=-8 x3=27 x3=-64 x3=125 x3=216 x3=512 x4=16 (2-x)5=32 128:(x-3)5=4 32.(x-3)3=-256 134-(x-3)4=118 134-x-35=102 694+(x-7)3=182 x2=579 x2=493 x2=114 x2=15-11+20190 x2-5=4 (x-3)2+5=69 (x-7)2-10=71 (x-9)2+15=115 64-x2=-57 2-(x-3)2=-142 2x3=-16 -81:x3=15-12 (x-3)3:8=-8 (x+7)3.5=625 (-x-7)3-49=167 (x-13)3:7=49 (2-x)4=-(-32+16) 2.(x-3)5=64 497-4.(x+7)5=369 496+3.(x-3)2=739 216-4.(x+7)2=20 49:(x+7)2=-20180+2 56.(109+2x)2=224 (-6x+32)3.2+1089=-911 2.(x+9)2-634=390 25-(2x+4)2=9 193+(x-7)2=418 269-(x+7)2=269 41.(x-6)2=1476 (-5x+39)2+30=31 448:(x+9)2=7