把算式和得数连上线 (1) (2)12-5 15 8+6 6 6+9 4 11-3 16 13-7 7 13-8 5 12-8 8 9+7 8 14-6 6 12-6 14
0.8+0.55+1.2-0.45
+-
1--
口算。+= -= += - +=0.63×1000= 0. 75-0.25= 0.07+0.03= 0. 9÷0.03= 0.4×0.8=
×= ÷3=÷= -=3÷15= +0.25=1÷= 85%-15%=10÷10%= 5×÷5×=