(125/1+0.8)x1.25 (方法)
=125/1×1.25+0.8×1.25
=0.001+1
=1.01
9/7x11/5+9/5x11/1 (方法)
=9/5×11/7+9/5×11/1
=9/5×(11/7+11/1)
=9/5×11/8
=99/40
(6/1+3/1+2/1)x12 (方法)
=6/1×12+3/1×12+2/1×12
=2+4+6
=12
100x98/5 (方法)
=(98+2)×98/5
=98×98/5+2×98/5
=5+49/5
=5又49/5
(125/1+0.8)x1.25 (方法)
=125/1×1.25+0.8×1.25
=0.001+1
=1.01
9/7x11/5+9/5x11/1 (方法)
=9/5×11/7+9/5×11/1
=9/5×(11/7+11/1)
=9/5×11/8
=99/40
(6/1+3/1+2/1)x12 (方法)
=6/1×12+3/1×12+2/1×12
=2+4+6
=12
100x98/5 (方法)
=(98+2)×98/5
=98×98/5+2×98/5
=5+49/5
=5又49/5