Help to calculate, can calculate simply 1 - (3 and 1 / 2-2 and 1 / 2 △ 1 and 1 / 4) * 4 / 9 2000 △ 5 / 21-3 and 1 / 5 * 2000 [0.186 + (1 and 3 / 4-1 / 2) - 0.186-1 and 1 / 4] + 45 7/10÷(1-3/4*0.4)
1-(7/2-5/2*4/5)*4/9=1/3
2000*21/5-16*2000/5=2000/5*(21-16)=2000
[0.186-0.186 + (1 and 3 / 4-1 and 1 / 4) - 1 / 2] + 45 = 45
7/10÷(1-3/4*4/10)=1
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