|
(1)8.4×0.26+
=2.184+0.625, =2.809. (2)
=
=
(3)31.7-0.5×0.7-1.65 =31.7-0.35-1.65, =31.7-(0.35+1.65), =31.7-2, =29.7. (4)0.8×(3.2-
=0.8×(3.2-0.2), =0.8×3, =2.4; (5)42.3×18+7.7×18 =(42.3+7.7)×18, =50×18, =900. (6)
=
=
=34. |
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