20题开头求1的有理数加减。很容易犯错误。乘法也可以~ ~没学除法就别打了~ ~至少记住20题。
① 0.36+(—7.4)+0.3+(—0.6)+0.64
② -4.2+5.7-8.4+10
③ (-40)-(+28)-(-19)+(-24)-(32)
④ -40-28-(-19)+(-24)-(-32)
⑤ 81.26-293.8+8.74+111
⑥ (+4.7)-(-8.9)-(+7.5)+(-6)
⑦ [1.8-(-1.2+2.1)-0.2]-(-1.5)
⑧ -216-157+348+512-678
⑨
⑩
⑾
⑿
⒀
⒁ (+3 )+(+4 )-(+1 )+(-3 )
⒂ 0.5+(- )-(-2.75)+
⒃(-15 )-[(-13 )+(-31 -14)]
⒄ (+3 )+(+4 )-(+1 )+(-3 )
⒅ -︱- -(- )︱-︱(- )+(- )︱
⒆ -︱-0.25︱+ -(-0.125)+ ︱-0.75︱