Question

Tính nhanh

a, 126 . ( -43 ) + 26 . 43

b, ( -135 ) . ( -45 ) - 35 . 45

c, 113 . ( -27 ) + 27 . 13

d, 125 . ( -35 ) - ( -25 ) . 35

Answer 1

a)126.(-43)+26.43=43(-126+26)=43(-100)=-4300

b)(-135)(-45)-35.45=-45(-135+35)=-45(-100)=4500

c)113(-27)+27.13=27(-113+13)=27(-100)=-2700

d)125(-35)-(-25).35=-35(125-25)=-35.100=-3500

Answer 2

\(a)126.\left(-43\right)+26.43\)

\(=\left(-126\right).43+26.43\)

\(=43\left(-126+26\right)\)

\(=43.\left(-100\right)\)

\(=-4300\)

\(b)\left(-135\right).\left(-45\right)-35.45\)

\(=135.45-35.45\)

\(=45\left(135-35\right)\)

\(=45.100\)

\(=4500\)

\(c)113.\left(-27\right)+27.13\)

\(=\left(-113\right).27+27.13\)

\(=27\left(-113+13\right)\)

\(=27.\left(-100\right)\)

\(=-2700\)

\(d)125.\left(-35\right)-\left(-25\right).35\)

\(=\left(-125\right).35-\left(-25\right).35\)

\(=35\left(-125+25\right)\)

\(=35.\left(-100\right)\)

\(=-3500\)