Question

口算速算． 1-O.75=	2.3×5=	0.57+0.43=	0.25×4=
1.36+0.24=	2.01×4=	2.82+0.8=	7.6-6=

Answer 1

分析：根據(jù)小數(shù)加減法和乘法的計(jì)算方法進(jìn)行計(jì)算．

解答：解：

1-O.75=0.25	2.3×5=11.5	0.57+0.43=1	0.25×4=1
1.36+0.24=1.6	2.01×4=8.04	2.82+0.8=3.62	7.6-6=1.6

點(diǎn)評：口算時(shí)，注意運(yùn)算符號和數(shù)據(jù)，然后再進(jìn)一步計(jì)算．