Question

Tính bằng cách thuận tiện:

60-26,75-13,25                                            38,25-18,25+21,64-11,64+9,93

45,28+52,17-15,28-12,17                            (72,69+18,47)-(8,47+22,69)

Answer 1

a: \(60-26,75-13,25\)

\(=60-\left(26,75+13,25\right)\)

\(=60-40=20\)

b: \(38,25-18,25+21,64-11,64+9,93\)

\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)

\(=20+10+9,93=39,93\)

c: \(45,28+52,17-15,28-12,17\)

\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)

=30+40

=70

d: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)

\(=72,69+18,47-8,47-22,69\)

\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)

=50+10

=60

Answer 2

nhanh lên giúp mik.mik đang cần gấp