解方程、简便运算强化训练一、解方程。 3X= X= X= =30% X = X-0.25= X=20 50% X + X = 3.6 25% X + 15%X = X - 15%X = 68 X X = XX121 XX= X + X = 4 X+X=20 6X5 =13.4 4 X638 X+=4 X3 9 = 29 5X3 4X6=20.365- X = X - 0.8 X = 16+6 ( X - 4.5) = 7 X12 2(X-2.6)=8 X-X=X( + )= X0.375 X = 20 X 8.5= 1.5 X - X -4= 21 4+0.7X=102 X - 25% X = 10二、简便运算。（- ）60 36 0.65101（1.25-0.125）8 258 24(-) (12+) 7 1310.2 2.699 + 27.53.7-7.53.7 +101- 99 + -103-2- 0.921.410.928.59 2.254.8+77.50.48 4.87.8+780.52 1.311.61.61.3 (15) 4.3612.58 2.5321.25 1.250.8 9.63.23 15.20.254 33 146.5-（23+46.5） 12.89-(3.89-1.6) 73.8-1.64-13.8-5.36 15.75+3.59-0.59+14.255.48-（9.4-0.52） 12.065.072.94 30.349.7610.34 二、简便运算。（712 - 15 ）60 363435 0.65101（1.25-0.125）8 2538 8 24( - - - ) (12+ ) 7 1310.2 2.699 X - 45 X -4= 21 47 613 +37 613 27.53.7-7.53.7 0.921.410.928.59 710 101- 710 35 99 + 35 30.349.7610.34 2.254.8+77.50.48 4.87.8+780.52 1.311.61.61.3 227 (152728 )215 4.3612.58 2.5321.251.25 0.8 9.63.23 15.20.254 89 89 89 89 12.065.072.94 146.5-（23+46.5） 12.89-(3.89-1.6) 73.8-1.64-13.8-5.36 15.75+3.59-0.59+14.255.48-（9.4-0.52） 4 X3 9 = 29 5X3 4X6 =2 0.365- 34 X = 35 X - 0.8 X = 16+6 23 ( X - 4.5) = 7 X 12 2(X-2.6)=8 25 X-13 X=310 4+0.7X=102 X( 16 + 38 )=1312 X0.375 X = 20 X 8.5= 1.5 12 X - 25% X = 10 二、简便运算。（712 - 15 ）60 363435 0.65101 35 99 + 35 （1.25-0.125）8 2538 8 710 101- 710 27.53.7-7.53.7 (12+ ) 7 1310.2 2.699 710 101- 710 47 613 +37 613 0.921.410.928.59 2.254.8+77.50.48 4.87.8+780.52 1.311.61.61.3227 (152728 )215 4.3612.58 2.5321.251.25 0.8 9.63.23 15.20.254 89 89 89 89 146.5-（23+46.5） 12.89-(3.89-1.6) 73.8-1.64-13.8-5.36 15.75+3.59-0.59+14.251253625 31/3031 5.48-（9.4-0.52） 12.065.072.94 30.349.7610.34