①361-99
=361-100+1
=261+1
=262;
②0.7+3.8+4.2+9.3
=(0.7+9.3)+(3.8+4.2)
=10+8
=18;
③
×3 5
+1 4
×3 5
3 4
=
×(3 5
+1 4
)3 4
=
×13 5
=
;3 5
④(
-1 51
)÷2 87
+22÷511 29
=(
-1 51
)×29+22÷512 87
=
-29 51
+2 3
22 51
=
+29 51
-22 51
2 3
=1-
2 3
=
;1 3
故答案为262;18;
;3 5
.1 3