数学题添加符号,帮帮忙!1 2 3 4 =81 2 3 4 5 =81 2 3 4 5 6 =81 2 3 4 5 6 7 =81 2 3 4 5 6 7 8 =8帮忙添上适当的数学符号,使等号两边相等.
2019-06-20
数学题添加符号,帮帮忙!
1 2 3 4 =8
1 2 3 4 5 =8
1 2 3 4 5 6 =8
1 2 3 4 5 6 7 =8
1 2 3 4 5 6 7 8 =8
帮忙添上适当的数学符号,使等号两边相等.
优质解答
(1-2+ 3)× 4 =8
-1+2+3×4-5 =8
-1×2×3+4×5-6 =8
-（1+2+3×4）+ 5×6-7 =8
1-2+3+4-5+6-7+8 =8
注：
(1-2+ 3)× 4 =2×4=8
-1+2+3×4-5 =1+12-5=13-5=8
-1×2×3+4×5-6 =-6+20-6=20-12=8
-（1+2+3×4）+ 5×6-7 =-（3+12）+30-7=-15+30-7=30-22=8
1-2+3+4-5+6-7+8 =（1-2)+3+(4-5)+(6-7)+8=-1+3-1-1+8=3-3+8=8
(1-2+ 3)× 4 =8
-1+2+3×4-5 =8
-1×2×3+4×5-6 =8
-（1+2+3×4）+ 5×6-7 =8
1-2+3+4-5+6-7+8 =8
注：
(1-2+ 3)× 4 =2×4=8
-1+2+3×4-5 =1+12-5=13-5=8
-1×2×3+4×5-6 =-6+20-6=20-12=8
-（1+2+3×4）+ 5×6-7 =-（3+12）+30-7=-15+30-7=30-22=8
1-2+3+4-5+6-7+8 =（1-2)+3+(4-5)+(6-7)+8=-1+3-1-1+8=3-3+8=8