简便计算。,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
（1）1285-475-525=3G(I7h9H+|,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
算式：提示9H3C7@4k+G'}'Z,}+^,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
（2）983-347+547=)b9j;o0E,c)e,c9\4k6G,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
算式：提示;_-U;r:^(Q+V/R;O:V,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
（3）100-98+96-94+92-90+...+4-2=+_(n6^1O4K/d8G,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
算式：提示-W1`,D)U)P2S7W,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
（4）9×7÷7×7÷7×5÷5×5÷5=/j4b'?*i+k,r7j/^)`8u1I;y-Z1f5|3_;l;_0D
算式：提示.@1G5J0r+y'B,a-n'X-l4o,r7j/^)`8u1I;y-Z1f5|3_;l;_0D