Question

tính nhanh:

câu 1: 0.36 x 630 + 0.6 x 36 x 6 + 3.6

câu 2: 3.5 x 20.2 +6.5 x 27.9 + 3.5 x 2.2 - 6.5 x 5.5

giúp mik làm câu này mik đang cần gấp

Answer 1

Câu 1 : \(0,36\times630+0,6\times36\times6+3,6\)

\(=0,36\times10\times63+0,6\times6\times36+3,6\)

\(=3,6\times63+3,6\times36+3,6\)

\(=3,6\times\left(63+36+1\right)\)

\(=3,6\times100\)

\(=360\)

 Câu 2 :\(3,5\times20,2+6,5\times27,9+3,5\times2,2-6,5\times5,5\)

\(=3,5\times\left(20,2+2,2\right)+6,5\times\left(27,9-5,5\right)\)

\(=3,5\times22,4+6,5\times22,4\)

\(=22,4\times\left(3,5+6,5\right)\)

\(=22,4\times10\)

\(=224\)