Bài 1: Tính bằng cách hợp lí: a, 11frac{1}{4}-left(2frac{5}{7}+5frac{1}{4}right)b, left(8frac{5}{11}+3frac{5}{8}right)-3frac{5}{11}c, -frac{1}{4}.13frac{9}{11}-0,25.6frac{2}{11}d, frac{4}{9}:left(-frac{1}{7}right)+6frac{5}{9}:left(-frac{1}{7}right)Bài 2: Tính bằng cách hợp lí( nếu có)a,left(1,11+0,19-26right):left(2,06+0,54right)-left(frac{1}{2}+frac{1}{3}right):2b, left(2frac{1}{3}+3,5right):left(-4frac{1}{6}+3frac{1}{7}right)+7,5c, -15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8Bài 3: Tìm x, biết:a, frac...
Đọc tiếp
Bài 1: Tính bằng cách hợp lí:
a, \(11\frac{1}{4}-\left(2\frac{5}{7}+5\frac{1}{4}\right)\)
b, \(\left(8\frac{5}{11}+3\frac{5}{8}\right)-3\frac{5}{11}\)
c, \(-\frac{1}{4}.13\frac{9}{11}-0,25.6\frac{2}{11}\)
d, \(\frac{4}{9}:\left(-\frac{1}{7}\right)+6\frac{5}{9}:\left(-\frac{1}{7}\right)\)
Bài 2: Tính bằng cách hợp lí( nếu có)
a,\(\left(1,11+0,19-26\right):\left(2,06+0,54\right)-\left(\frac{1}{2}+\frac{1}{3}\right):2\)
b, \(\left(2\frac{1}{3}+3,5\right):\left(-4\frac{1}{6}+3\frac{1}{7}\right)+7,5\)
c, \(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
Bài 3: Tìm x, biết:
a, \(\frac{2}{7}+x=20,75\)
b, \(-4\frac{1}{5}-x=2,25\)
c, \(x:8,5=2,2\)
d, \(\left(\frac{2x}{5}-1\right):\left(-5\right)=\frac{1}{7}\)
