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1、-练习题(解方程+简便运算)-第 3 页一、解方程。 3X= X= X= =30% X=20 X = X-0.25= 50% X + X = 3.6 X - 15%X = 68 X X = XX121 25% X + 15%X = 6X5 =13.4 4 X638 X+= 4 X3 9 = 29 5X3 4X6=2 5- X = X X = 16+6 ( X - 4.5) = 7 X12 2(X-2.6)=8 X=102 X( + )= X - 25% X = 10 20 X X - X -4= 21 二、简便运算。(- )60 36 101 (1.25-0.125)8 5.48-(9.4-0
2、.52) 258 24(-) 2.254.8+77.50.48 103-2- + 3.7 + 32 101- 99 + - 7.8+780.52 8 32 1.250.8 3 4 33 146.5-(23+46.5) 12.89-(3.89-1.6) 73.8-1.64-13.8-5.36 99 12.065.072.94 30.349.7610.34 8 二、简便运算。(712 - 15 )60 363435 101(1.25-0.125)8 1399 47 613 +37 613 3.7 8.59 710 101- 710 35 99 + 35 0.48 7.8+780.52 227 (1
3、52728 )215 8 32 0.8 3 4 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 5.48-(9.4-0.52) 4 X3 9 = 29 5X3 4X6 =25- 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 36101 35 99 + 35 2538 8 710 101- 710 3.7 (12+ ) 7 1399 710 101- 710 47 613 +37 613 8.59 7.8+78227 (152728 )32 4 89 89 89 89 3 3 146.5-(23+46.5) 1253625 31/3031 5.48-(9.4-0.52) 12.065.072.94