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Several mixed operations of rational numbers 1-0.2×【-3-4×（18/5-5.3）】 （1/20-3/4）×【5/7+（-5/14）】 -22/7×（22/7-4/3）×7/22÷（-22/21） {4-【12+4×（3-10）】}÷5 The above four problems can be easily calculated by the formula
(1) The original formula = 1-0.2 * [- 3 - (3.6-5.3)] = 1-0.2 * [- 3 - (- 1.7)] = 1-0.2 * (- 1.3) = 2.6
(2) The original formula = (1 / 20-15 / 20) * (10 / 14-5 / 14) = (- 14 / 20) * (5 / 14) = - 1 / 4
(3) The original formula = - (22 / 7-4 / 3) * (- 21 / 22) = (22 / 7) * (21 / 22) - (4 / 3) * (21 / 22) = 3-14 / 11 = 19 / 11
(4) The original formula = {4 - [12 + 4 * (- 7)]} * (1 / 5) = [4 - (12-28)] * (1 / 5) = (4 + 16) * (1 / 5) = 4
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