Respuesta:
18- 5/7× (3/4+1/5)
5/7× (15/20+4/20)
5/7× 19/20= 19/28
19-. (-4/5+1/2)÷(-3/4)
(-8/10+5/10)÷(-3/4)
-3/10÷(-3/4)= 2/5
20- 2× 0,25×1/4+3
2× 1/4×1/4+3
1/8+3 = 25/8
21. √ 0,25+(-√16/100)
√1/4-4/10
1/2-2/5= 1/10
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Respuesta:
18- 5/7× (3/4+1/5)
5/7× (15/20+4/20)
5/7× 19/20= 19/28
19-. (-4/5+1/2)÷(-3/4)
(-8/10+5/10)÷(-3/4)
-3/10÷(-3/4)= 2/5
20- 2× 0,25×1/4+3
2× 1/4×1/4+3
1/8+3 = 25/8
21. √ 0,25+(-√16/100)
√1/4-4/10
1/2-2/5= 1/10