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七下计算题120道及答案

1. 3/7 * 49/9 - 4/3 2. 8/9 * 15/36 + 1/27 3. 12* 5/6 2/9 *3 4. 8* 5/4 + 1/4 5. 6÷ 3/8 3/8 ÷6 6. 4/7 * 5/9 + 3/7 * 5/9 7. 5/2 -( 3/2 + 4/5 ) 8. 7/8 + ( 1/8 + 1/9 ) 9. 9 * 5/6 + 5/6 10. 3/4 * 8/9 - 1/3 11. 7 * 5/49 + 3/14 12. 6 *( 1/2 + 2/3 ) 13. 8 * 4/5 + 8 * 11/5

1) 66x+17y=3967 25x+y=1200 答案:x=48 y=47 (2) 18x+23y=2303 74x-y=1998 答案:x=27 y=79 (3) 44x+90y=7796 44x+y=3476 答案:x=79 y=48 (4) 76x-66y=4082 30x-y=2940 答案:x=98 y=51 (5) 67x+54y=8546 71x-y=5680 答案:x=80 y=59 (6

18x+23y=2303 74x-y=1998 答案:x=27 y=79 44x+90y=7796 44x+y=3476 答案:x=79 y=48 76x-66y=4082 30x-y=2940 答案:x=98 y=51 67x+54y=8546 71x-y=5680 答案:x=80 y=59 42x-95y=-1410 21x-y=1575 答案:x=75 y=48 47x-40y=853 34

30.8÷[14-(9.85+1.07)] [60-(9.5+28.9)]÷0.18 2.881÷0.43-0.24*3.5 20*[(2.44-1.8)÷0.4+0.15] 28-(3.4+1.25*2.4) 2.55*7.1+2.45*7.1 777*9+1111*3 0.8*[15.5-(3.21+5.79)] (31.8+3.2*4)÷5 31.5*4÷(6+3) 0.64*25*7.8+2.2 2÷2.5+2.5÷2 194-64.8÷1.8*0.9

879+54=933 896-546=350 56*12=672. 45-5=9 457+456=913 7+14=21 18-9=9 8+16=24 25-5=20 9+18=27 56-45=11 10+20=30 45-23=22 11+22=33 78-23=55 12+24=36 10-3=7 15-4=11 20-5=15 25-6=19 30-7=23

(1)7(2x-1)-3(4x-1)=4(3x+2)-1; (2) (5y+1)+ (1-y)= (9y+1)+ (1-3y); (3)[ (1/4x-3)-4 ]=x+2; (4)20%+(1-20%)(320-x)=320*40% (5)2(x-2)+2=x+1 (6)2(x-2)-3(4x-1)=9(1-x) (7)11x+64-2x=100-9x (8)15-(8-5x)=7x+(4-3x) (9)3(x-7)-2[9-4(2-x)]=22 (10)3/2[2/3(1/4x-1)-

1. 1.25+3/4-5/12-3/82. -12*4-(-6)*53. -10+8÷(-2)-4*(-2)4. -9+5*(-6) -(-4)*2 ÷(-8)5. -12009+4*(-3)2+(-6)÷(-2)6. [(ab+3)(ab-3)-2a2b2+9]÷(ab) 7. (x+2)2-(x+1)(x-1) 8. (4x-3)-(5x-6)9. (25x2+15x3y-20x4)÷(-5x2)10. 2a(a+b)-(a+b)211. (x-2)(x+2)12. (-3a)(

我不知道诶3+1=4 4=5-1 5=4+15+1=6 6-1=55+1=69-1=88-1=7 5-1=49+1=10 10+1=115+1=66-1=5 8+1=9我不知道诶3+1=4 4=5-1 5=4+15+1=6 6-1=55+1=69-1=88-1=7 5-1=49+1=10 10+1=115+1=66-1=5 8+1=98-1=7 8-1=7我不知道诶3+1=4 4=5-1 5=4+15+1=6 6-1=55+1=69-1=88-1=7 5-1=49+1=10 10+1=115+1=66-1=5 8+1=98-1=7

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