851/3×3/8+711/6×6/7+561/4×4/5.
问题描述:
85
×1 3
+713 8
×1 6
+566 7
×1 4
. 4 5
答
85
×1 3
+713 8
×1 6
+566 7
×1 4
,4 5
=(80+5
)×1 3
+(70+13 8
)×1 6
+(55+16 7
)×1 4
,4 5
=80×
+53 8
×1 3
+70×3 8
+16 7
×1 6
+55×6 7
+14 5
×1 4
,4 5
=30+2+60+1+44+1,
=(30+60+44)+(2+1+1),
=134+4,
=138.