389 430×(
214+- ) 5615
276×+40% × 51313
10-(
23+×2) 55
71123 +×- 15455
[(
725 -1)÷ ]× 554211797174
99× ÷[( + )×30] 1
9821015351310
5123737
713134816161427253223 554
914814111 12
1517171524621171351310
解方程:+-×÷=
(1) 3.5X+1.8=12.3 (5) X+
(7) 3.6X÷2=2.16 (8) X+2421X=21 (6) X+X= 555223X= (2) 0.8X-4=1.6
(3) 5X÷2=10 (10) X-25=310 (13)
710X=1425
(16) 180+6X=330
(19) 15X÷2=60
(22) 5X-X=2.4
74 (4) X-0.25X=3 (11) 2X+7X=910 (14) 12X=34 (17) 2.2X-1=10 (20) 4X+X=3.15 (23) 1.5X-X=1 (9) X-235X=10 (12) 328+X=5 (15) 59X=10 (18) X-0.8X=10 21)3.4X+1.8=8.6 (24) 6.6X-6X=1.8
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