脱式计算.(能简算的要简算) (1)1/43+303/8686+90909/434343+131313/868686 (2)6.75−2.75÷[10×(9.75−41/4)] (3)0.365×640+31/2×36.5+365×0.01
问题描述:
脱式计算.(能简算的要简算)
(1)
+1 43
+303 8686
+90909 434343
131313 868686
(2)6.75−2.75÷[10×(9.75−4
)]1 4
(3)0.365×640+3
×36.5+365×0.01. 1 2
答
(1)
+1 43
+303 8686
+90909 434343
,131313 868686
=
+1 43
+3×101 86×101
+9×10101 43×10101
,13×10101 86×10101
=
+1 43
+3 86
+9 43
,13 86
=(
+1 43
)+(9 43
+3 86
),13 86
=
+10 43
,8 43
=
;18 43
(2)6.75-2.75÷[10×(9.75-4
)],1 4
=6.75-2.75÷[10×(9.75-4.25)],
=6.75-2.75÷[10×5.5],
=6.75-2.75÷55,
=6.75-0.05,
=6.7;
(3)0.365×640+3
×36.5+365×0.01,1 2
=36.5×6.4+3.5×36.5+36.5×0.1,
=36.5×(6.4+3.5+0.1),
=36.5×10,
=365.